I think this is a cairo bug. I filed a bugreport on their bugtracker:
https://bugs.freedesktop.org/show_bug.cgi?id=60519
-- drawoc
> A new issue seems to have cropped up. Now I get the following error:
>
> This is a development version of GIMP. Debug messages may appear here.
>
> Assertion failed!
>
> Program: C:\Win64\msys\opt\gimp-2.9\bin\gimp-2.9.exe
> File: ../../src/cairo-surface.c, Line 591
>
> _expression_: image->is_clear
>
> I recall recently Mitch committed some cairo patches, but I can't find it.
>
> I can fix the above by modifying cairo-surface.c but I think there may be
> a deeper issue?
>
> Thanks,
> Partha
>
>
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