I have made a character with bones animation in Cinema4D. When I add the archive .c4d to my assets folder in the unity project folder, and when unity tries to update the assets, suddenly Cinema4D crashes. Unity says: Cinema4D could’nt convert .C4D file to an fbx file…the best of all…is that after of this…cinema4d.app seems to be corrupted and it’s imposible to open it another time.
I have to reinstall the software and erase all the preferences files that had made in library.
Any suggestion? thank you in advance. 
I forgot…I have Unity indie 1.5 and cinema 4d 9 XL .
Ive got the same problem. Cinema 9.102 and Unity 1.5 under MacOSX 10.4.7
I have solved the crashing of cinema by removing the 9.5 unity plugin from the plugin folder manually, but it still doesn´t convert. I used the internal fbx export of cinema, wich actually works fine.
But sometimes, for some reason i yet havent figured out, normals are not exported correctly or exported at all. And sometimes they are.
So, solving that cinema to unity issue would certainly help a lot…
@Blue… DONT REINSTALL! Just remove the PlugIn!
I think, that regarding the general fbx export problem of cinema 4d 9.102, it might be an issue of c4d and not an error within unity. Maybe the PlugIn does not get what it wants from c4d and though reports an error…
I will do a fresh install of c4d this weekend on a second comp and see, what fbx-data can be exported from there…
There currently is an issue with cinema 4d 9.0 of. It works fine with c4d 9.5 and up.
Until the issue is resolved you can use the fbx exporter from cinema 4d or upgrade to 9.5.
Ok, I will be using the FBX exporter from C4D.
A lot of thanks!