I am unsure why it is happening, but it does seem like it is a problem with translating the colors from the website into CC3+ colors, so they all end up at the default. I couldn't get it to behave myself, so I've asked those that knows more about this than me to look at it.

But, I did notice that if you use the "generate script file" option from the import dialog, you get a script file you can run to make the drawing. And the advantage here is that this is a text file you can edit. The first part of it is all the polys for the borders, and you'll noticed they are all prefixed by a COLOR 15 statement. You can then simply edit these, changing them to other color numbers, and then run the script file from inside CC3+ (Tools -> Macros -> Script File). You'll be editing a little blind since it is difficult to envision the look of the polygon from these candidates, but at least you can just keep the script file, tweak it, and re-run it....

If a command seems stuck, it can also help just hitting the Esc key a couple of times.

CC3+ should handle negative numbers just fine, just make sure there isn't an extra space between the minus sign and the number.

Also keep in mind that you have two options when typing coordinates.

Either you type the destination coordinates outright (112,45 or 112,-45 etc.), and in that case you don't use negative numbers since all the coordinates in the map are positive (except some special templates)

Or, you use the relative coordinates for a relative movement from the move origin, in which case you prefix with @ and negative numbers means downwards and leftwards (ex @10,20 or @-10,20 or @-10,-20 etc.)

You can use the TRACED command to trace it automatically, but you do need to make a small config file change to work around a bug in the current version.

If you have entities that are completely identical (same position, same properties), you have to select them by entity tag number (scroll down a bit on that page to find the specifics for that particular one).

And yes, the group tags you see in the list output is also an entity tag number, so you can delete a whole group that way. (Individual entities inside a group can only be selected if groups are unlocked, and the group tags can only be selected if groups are locked).