I just had slic3r crash immediately on startup. When I ran it again, I managed to load a model and change some settings, but when I tried to export gcode it gave me this message:
Free to wrong pool 1b2f3460 not 83555e0 at C:/Slic3r/std/threads.pm line 101
Hopefully this will help someone diagnose the bug. I had numerous crashes with earlier 1.2.x versions including 1.2.9, but not before with 1.2.9a. I am running the x64 Windows build under Windows 7.
Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod
Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].