I also remember having trouble getting the click on the '+' field to register. A problem I've found is that the cursor becomes unsynced (best way I can describe it), where you can click on a specific spot on the map (especially in tactical battles), and yet the click registers quite a ways away (1.5-2 squares). So, it's possible you developed this problem and the game is thinking you're not clicking on the options (when the user interface shows that you are); try clicking all around the area to find the sweet spot, and then hope the issue is quickly addressed. Heh, difficult to have tactical combat when your mouse uncalibrates itself and units are moving in directions you don't want them to go (my suspicion is this happens after zooming in and out of the battles).
Plenty of bugs that need squashing, but if Frogboy is still on top of it, they're getting the attention they deserve (unless he's wasting his time trying to become an author when he should be focusing on making the game smooth 
).
