I haven't been able to reproduce this issue on my machine.
Can you therefore try to do the following:
* Close Diodon
* run diodon from the command line: G_MESSAGES_DEBUG=all diodon > diodon_debug.txt
* let it run and occasionally clear history till the error occurs as you have described it
* close Diodon straight away and attach diodon_debug.txt to this bug
I haven't been able to reproduce this issue on my machine.
Can you therefore try to do the following: DEBUG=all diodon > diodon_debug.txt
* Close Diodon
* run diodon from the command line: G_MESSAGES_
* let it run and occasionally clear history till the error occurs as you have described it
* close Diodon straight away and attach diodon_debug.txt to this bug
Thanks,
Oliver