I think I just found a nasty error in the BUG dotmap function (which might be entirely internal to BUG, or might be caused by some interaction with HR). If you click on one of the palette's 'empty' color blocks, the applicator changes from a BFC shape to a single tile square. If you then click on a tile, the dotmap locks and trying to close it results in the following error message:
"Error in kbdEvent event handler <bound method BugEventManager.onKbdEvent of <BugEventManager.BugEventManager instance at [alphanumeric string that I think ID's the tile clicked on]>>"
Ooh, just tested this and, yeah, all sorts of errors being thrown. Seems to be something to do with defined colours; it's possible I've inadvertently removed or renamed a colour definition that BUG relies on. I actually need to rebuild the entire colour definitions file (as part of solving the Mac <-> PC multiplayer incompatibility) so I'll examine this at the same time. Good catch.
On an unrelated topic, is it possible to change the default hotkeys? Specifically, is it possible to change the screenshot hotkey from "Print Screen" to something that actually exists on my keyboard? If so, how?
It is possible to change many hotkeys, but the screenshot key doesn't seem to be one of them. I suspect that it's defined by Windows and not BTS. OSX's Shift-Ctrl-3 and Shift-Ctrl-4 do work though.
Btw, I'm redefining several hotkeys for 1.19, Improvement ones in particular (as suggested).