I might be a bit late but this is a bug in LLVM 3.9 that occurs because of the version packaged in Padoka’s Mesa Stable PPA. It seems to happen with Gtk2 apps only.
I’ve tried Oibaf’s Mesa dev PPA recently, with LLVM 4.x, and the pink tint was gone, so it’s been fixed at some point. Not sure what’ll happen next on Padoka’s PPA when he packages Mesa 13.0.4 or Mesa 17.0 (not sure he’ll build them against a newer version of LLVM).