Hmm ... the solution was not only to restart zope. I had to stop and start it.
Are there any konwn issues concerning zope 2.5.0 and LocalFS? I get errors installing this product:
Traceback (most recent call last): File "/usr/local/zope/Zope-2.5.0-src/lib/python/OFS/Application.py", line 5 31, in import_product product=__import__(pname, global_dict, global_dict, silly) File "/usr/local/zope/OtherProducts/LocalFS/__init__.py", line 65, in ? traceback.print_exc() File "/usr/lib/python2.1/traceback.py", line 210, in print_exc print_exception(etype, value, tb, limit, file) File "/usr/lib/python2.1/traceback.py", line 122, in print_exception _print(file, 'Traceback (most recent call last):') File "/usr/lib/python2.1/traceback.py", line 13, in _print file.write(str+terminator) IOError: [Errno 5] Input/output error