This happens if in Tools -> Options, you deselect the "Select with right button context menu" option.

The reason it pops up when you click in your map is that clicking in your map without a command active will automatically repeat the last command, and if the option mentioned above is unset, this will pop up if the command require a selection.

@JimP Looking at these now, and I am wondering a bit on the scale of the the_mithlas_holes_hillentrance.FCW map. The entire map is 3000 x 2200 feet. Converted to miles, that's 0.57 x 0.42 miles. That means that the region on the parent map (the_mithlas_holes_area.FCW) it describes is utterly minuscule, and wouldn't really fit both giant's garden and the mithas holes entrance on the same map. See the solid colored pink rectangle in the image below for the actual area covered here.

The map itself is fine as it is, so my suggestion is just to scale the entire map by a factor of 10, making it cover 30000 by 22000 feet instead (Suggested size shown by the hollow pink rectangle in the image), or whatever you find appropriate. Just remember to actually scale the entire map by the chosen amount, and not just edit the number on the scalebar.

Scalebar on the_mithlas_holes_entrance.FCW also reads "Scale in Miles". I am assuming this is feet?

Changing the scale in symbol manager is done on a one for one symbol basis. So if you did it to a single tree symbol, then that particualr symbol would be rescaled and also placed at the new scale, but not "all trees". Symbol manager also only shows you symbols you've used in your map so far, so it is impossible to use it to use it to change scale of future symbols you haven't used yet.

Also remember that the scale you set in symbol manager will represent the default scale of the symbol, but a symbol will still be affected by the current symbol scale from the symbol parameters dialog.

No. You need to scale them one by one in symbol manager. And note there is no concept of original scale. Once you have scaled something, the actual entities are changed, it's not something that can just be turned off again. You need to scale them with the appropriate reverse operation (for example, if you scaled them to 0.5, you need to scale them by 2 to get them back to the original size.)

Are you sure you used the same symbols? I did a quick test, and SiA obeyed the scale of the symbols according to the symbol manager. Note that SiA uses the default symbol scale for the map though, so while manually placed symbols are also affected by the scale from symbol parameters, SiA is not, it fetches the default value from the drawing presets dialog instead. Of course, there is also a scale option inside SiA, if that is set to anything but 100%, that will also change the scale the symbols are placed at.

You can find an explanation in this FAQ topic:

Yes, that's the most likely explanation.

A alternative explanation is that you simply didn't notice there was more pages. Opening a thread shows you the latest unread message, which would have been Medio's on the bottom of page 2. If you didn't notice the page counter wasn't on the last page, you may simply not have realized there were further messages there.