UBB.threads PHP Forum Software Community Forums UBB.threads 7 Version 7 Support Gallery does not show picture but only filename

I check again all directories of the galleries and tmp. They are all 777. I also tried to use the attachment. The attachment works. I see the corresponding file in the tmp directory, but only that one.

I then tested GD2. It works perfect. I see the catcha after adding the test sequence to the address bar...

Any other test or suggestions??