Stopped running Cygwin, where to dig?

Question

Cygwin

I launch for example from a shortcut on the desktop, a file 'mintty.exe.stackdump' appears next to it
with the following content

Stack trace:
Frame        Function    Args
000FFFFCCC0  0018005C7EE (001802290E0, 0018021AC59, 00000000010, 000FFFFBB10)
000FFFFCCC0  00180046349 (000FFFFCDF0, 000FFFFCCC0, 00000000000, 00000000000)
000FFFFCCC0  00180046382 (00000000000, 00000000000, 00000000010, 000FFFFCCC0)
000FFFFCCC0  0018005A197 (00180142889, 001801FC280, 0018017F0E2, 000FFFFCE00)
000FFFFCCC0  001800E7AEA (00000000000, 00000000000, 001800B2DBE, 00000000000)
000FFFFCCC0  00180046A54 (00000000000, 00000000000, 00000000000, 00000000000)
00000000000  001800455E3 (00000000000, 00000000000, 00000000000, 00000000000)
000FFFFFFF0  00180045694 (00000000000, 00000000000, 00000000000, 00000000000)
End of stack trace

Previously worked great. I didn't use it for a while, now it's a problem.
Windows 8.1_64