Linux Segmentation Fault 11
This is due to signal: Segmentation fault(11).
Application: fledermaus
Version: Fledermaus 7.1.2a, Build 453, 32 bit Edition
or see something similar to:
QGLContext::makeCurrent(): Cannot make invalid context current.
QGLFormat::setSamples: Cannot have negative number of samples per pixel -1521677200
libpng warning: tRNS chunk not allowed with alpha channel