I cannot reproduce this problem.
First, try tce-load -i gimp2.
If you get any errors, identify what they are.
Other troubleshooting tips:
Cd to your tce/optional directory, and grep the txt files for the missing object files.
Once you identify which extensions provide these objects, you can use AppBrowser to check Depends for gimp2
to make sure the dependency is listed.
If the dependency was not listed, report the error to the maintainer of the extension.
If they are listed, try to tce-load -i the extension and identify any errors.