System cache filling up with Gimp AppImage

[Ofnuts]

Are you using any scripts? Because some of them could leave unused (and unreachable) images around. If you have the Python console, try either:

Code:

print gimp.image_list()  # Raw
print "\n".join([str((i.ID,i.name)) for i in gimp.image_list()]) # Clean

And see if you can relate all the output with open images.