When using rhodecode as git repository browser the diff link seems wrong. Example:
http://rhodecode.server.com/Test/diff/gitA/pom.xml?diff2=0a04d700929e404dacaae7eff7e69389156d1b98&diff1=0a04d700929e404dacaae7eff7e69389156d1b98&diff=diff+to+revision

(Note the hashes are the same for the last and current version, thus no changes will be displayed in rhodecode)

The other links work fine, so i don't suspect the rhodecode installation is wrong.