OK, this is my reliable repro:
Not running any jobs.
From the "Convert E-books" toolbar button, select the "Select defaults for conversion", click OK on the "Set conversion defaults" dialog, go to the Output combo and change the output format.
Repeat all the above. This crashes every time the second time I mouse over the combo box.
With the debug mode I got:
"link hasn't been detected!".
I ran calibre again without debug, and when it crashed I got an unhandled exception:
Code:
..\Objects\classobject.c:2230: bad argument to internal function
Detailed traceback:
Traceback (most recent call last):
File "calibre\gui2\dialogs\jobs.pyo", line 54, in update_running_time
SystemError: ..\Objects\classobject.c:2230: bad argument to internal function
I thought I would attach a crash dump here but Windows has got a lock on the dmp file so I can't copy it!