the same thing also happens on my device and I'm working on a fix.

Most probably right after the coding competition feature freeze - its not yet working correctly on the Espeak side anyway and I'll have to contact the Maemo Espeak package maintainer.

I have also filled in "add Farsi support" ticket on the modRana project issue tracker. If you post a comment on it, I think you should get a notifications email about any changes (eq. when its implemented or more information becomes available).

I think that if you delete the rendering_ subfolders after unpacking it, it should take up much less space. But I'll also try to check if there are some other repositories with compatible Monav routing data that have it.

Missing python-protobuf dependency & routing failing on the first route should both be fixed in V0.35.9.
The second one was probably caused by a race condition during the monav-server startup (the server is started once modRana gets a first offline-routing request and is stopped on modRana shutdown). I've set the communication socket to be blocking and it doesn't happen anymore.

It is also not dependent in any way on the Monav package used by Marble - its ARM compiled binary lives in /opt/modrana/modules/mod_route/monav_armv7/. There is also a amd64 compiled binary in monav_amd64 for desktop testing, that will be removed from the N900 package in the near future to save space (about 300 kB).

Try to update to V0.35.9 and see if it now works.
Also make sure that you have Monav selected in menu->options->Navigation->Routing as the routing provider. Also, offline routing currently doesn't support address 2 address routing - it will fall-back to online routing in this case.

BTW, I've "wikified" the ModRana offline routing guide.