The bug is living in Yakkety Yak (Xubuntu 16.10) as tested right now ...
same error messages when selecting a region and trying to move it:
*** stack smashing detected ***: xpaint terminated
Aborted (core dumped)
It's a pitty that there seems to be no one responsible/able to fix the error.
I am still willing to help ...
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xpaint crashes due to stack smashing on Vivid Vervet and Xenial Xerus
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