@maru
We also encountered an issue where the Team Render clients in Cinema 4D showed an error message claiming there wasn’t enough RAM available.
It turned out, however, that the real problem was simply that the Team Render clients weren’t logged into Corona. (I find this behavior quite odd—there was no indication on the clients themselves that they were not logged in.) Only after briefly launching the Corona Image Editor did the licensing prompt appear. Once we logged in, Corona worked normally and the RAM issue disappeared.
Maybe this information helps. It would definitely be better if Corona showed a proper error message—something like a licensing issue instead of a misleading RAM error. Also, I think the Team Render integration could use much more attention; there are quite a few problems that still need addressing.