I was unable to find this topic via search, so my apologies if this is already a known issue.
Otherwise, here is the bug:
TG2 will immediately crash if the image map shader is used, set to projection, and the cursor is placed over the preview window (and possibly over the fractal preview window as well). It seems to crash every time, and has seems to have been a bug since day one. Luckily its not a debilitating crash, you just have to be careful not to drag the cursor over those 2 areas and you'll be fine.
Many thanks for your updates and bug fixes so far.