Unable to get back into game after minimizing?

[nwhite224]

Hey guys,
So I got this game recently, in alpha 11a, and I've been loving it so far.  But since 11b, whenever I minimize the game for whatever reason, the icon disappears off my taskbar like it closed.  Sometimes I can get back into it via task manager, but other times it actually closes and I have lost save data because of it. 
Any suggestions?

EDIT: No mods running at all.