And, here's @AleD's contribution, The Blue Rose Tavern,, now in the atlas

Most probably there is a problem opening the map. CC3+ loads the last map on startup, so if something goes terrible wrong doing that, symptoms like that can manifest.

Easiest way is to make sure all instances of CC3+ are shut down (use task manager to kill them if required, or reboot your computer), then instead of clicking the CC3+ icon to start the program, double click on any map file instead as that will start the program with that map instead (Obviously, don't try to double click on the suspected problematic map, but try something known good, like one of the example files that came with the program)

When I try to work out where the problem lies, I often use a series of elimination step. Start by hiding half the sheets and testing, until I have narrowed down which sheet it is on, then do the same for the layers involved on that sheet. Then I start eliminating the entities on the sheet, half at a time.

Often, you can use quicker export options when you narrow down a problem. For example, exporting to bmp skips most of the final conversion step, and you can usually export at a lower resolution and turn off things like antialiasing, or even export without effects on. Just test with reduced export settings first to see if it still crashes, sometimes the conditions are no longer fulfilled for the crash when you do that, but if it still does, then it is no need spending 10 mins on each elimination step when you can spend 30 secs.

As for turning off progressive jpg, I have no idea whatsoever why that would help with anything. That option is used in the final conversion step, i.e. AFTER CC3+ have rendered everything, and have a complete bitmap to convert to jpg, while for me at least, it crashed during the actual rendering step long before that option can affect anything.

There are several ways you can post your maps to this forum. This post showcases the different options. See the comment below for an example.

Embedding in a post

The easiest way to post a map is to embed an exported image of it into a post. There are multiple ways to do this, you can click the small image icon at the bottom of the post editor to pick a file from your computer, you can drag a file from your computer, or if you have an image on your clipboard, you can even paste it with Ctrl+V. As long as it is an image (.png or .jpg), it will show up inline in your post.

The images are restricted to a maximum of 5 MB in size. Anything larger than that, and an error message will show in the post box. You can close this error message if you want by using the X in the top right corner of it, but it won't be included in your post either way. Uploaded images will be resized to fit in the post (max 1500x1500px), so uploading an image larger that that won't do you any good.

Note that even though images can be up to 5MB, smaller images is much kinder on people having slow or metered connections. I highly recommend that you stick to jpg images over png whenever possible. Jpg is much smaller, and the visual difference is almost non-existent. Jpg is often an issue for people editing the image, but you are usually not posting images for other people to edit anyway, but to showcase your own work.

Attachments

You can also create attachments to your post. Just as with images, you can drag and drop these, or click the attachment clip at the bottom of the post editor to add an attachment. Any files that are dragged into the post editor becomes an attachment if it isn't an image. Note that if you want to upload an image as an attachment instead of displaying inline, you can also use the attachment clip.

As for inline images, attachments are also limited to 5MB in size, and only common file types like text, pdf, office documents, CC3+ maps/templates/symbol catalogs and zip files are allowed.

Note that posting your .fcw files as attachments is a great way for people to take a closer look at your maps, but you should always accompany that with an inline image in the post too, so people can see it right in the forum without opening CC3+. People might not have CC3+ on the computer they are using right then, or they don't have the addon you used so they can't see all the symbols, or they might be on their cell phone or tablet, unable to sue CC3+.

Image Gallery

Every user have their own image gallery where they can upload larger images. You'll find your image gallery by going to your profile page, and then hit the Gallery link in the sidebar. This is also how you visit other people's galleries.

Here you can create your own galleries, and upload images up to 15MB in size to them. As for images in posts, please do consider that a lot of people have slow or metered internet connection, so it might still be worth it to use smaller images if you wish most people to enjoy your gallery, trying to go for the largest image size allowed just to get the best quality may not be the best user experience.

Again, please consider jpg over png. The visual difference is miniscule, and since jpg is so much smaller than png, you can upload an image many times the resolution than you can manage with png, actually giving you a better quality image because of it.

Another way to make the gallery better for people with slower connections is to not have too many images in each album. It takes time to load all the thumbnails when someone enters an album, so it is better to have multiple albums with fewer images than just a few ones with a huge number of images in each.

Linking to a gallery image from a forum post is as easy as to first visit the image in the gallery viewer, copy the url shown in the address bar, and then paste it into a post.

There is a bug with a few of the Cos3 templates. You can grab an updated version of the installer from your reg page, or download the fixed templates only from here. That should hopefully fix things for you (note that fixed templates means it will work properly on new maps crated from these. For existing maps, I recommend just copying things over to a new map once you have confirmed this fix works for you)

Looks like your effect is set up to "Percent of View Width" instead of map units or percent of drawing extents width. Go in and edit the effect in question, and change this section. Do note that you may need to tweak the size of the effect after doing this, as you basically change the baseline for the sizing.

There are three entities in your map that is causing problems. Not sure how they occurred, but if you erase them, the zooming problem should go away.

These are entity numbers 114189, 114190, 115004

To erase an entity by it,s number, click :CC2ERASE: then right click inside the drawing area and from the selection pop-up, select more -> Entity Tag #. The command prompt should then show a Tag #: prompt. Type in one of the entity numbers from my list above and hit enter. If you did this correctly, the command prompt should show that you have one entity selected. Now, right click again and select Do It. Repeat for the remaining two entity numbers.

Assuming your friends don't have CC3+, the standard way would be to just export it as an image from the save as dialog. (See page 47 of thr User manual for details about the procedure). Optionally, you can print it to a pdf file instead, all modern versions of Windows comes with a virtual pdf printer installed you can print to to generate a pdf file.

Next one up, this time @Wyverns Cloven House

This time it is @arsenico13's entry going into the atlas: