I removed all third party plugins.
I moved the plugins folder of both qt4 & qt5 to /tmp separately.
I tried both CALIBRE_IGNORE_SYSTEM_THEME & CALIBRE_NO_NATIVE_FILEDIALOGS
The only thing in the debug till I kill the process was...
Quote:
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libpng warning: iCCP: Not recognizing known sRGB profile that has been edited
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...which is inconsequential to this problem.
strace-calibre.log is huge and beyond my depth to make any sense of.