I just found out that the version in the MODx Repository is not the same version as is distributed with 0.9.5, but unfortunately they both have the v1.0 number in the header. You should use the version that is distributed with 0.9.5, because some changes were done there. One of the changes is related to the Themes, which is probably your problem.
I will submit a bugreport for the language issue you mentioned earlier and try to mark the version in the repository as obsolete.
About the nature of MODx, it is not that you always have to hack all the plugins/snippets. This is just a few things coming together that cause some problems. Unfortunately these things can happen
EDIT: I submitted FS#844
for the language problem.