Hi,
OK, since it works fine with version 6.4, it's probably not an NFS issue (although I've seen some really strange NFS <-> Turbomole issues on some clusters. For RHEL-based systems, I haven't observed such problems). I ran some tests on one cluster and all CC2 optimizations ran OK with version 6.5 (serial, OpenMP, and MPI). I used the inputs that were created by "define", without any modifications. So maybe it's worth testing whether you can run some simple molecule like methane by creating the input just with define and submitting it directly. As far as I know, Turbomole should not really care about the order of the keywords in the control file, so in principle there should be no problem with your input. But for testing purposes, running a "standard" job without modifying the control file could be helpful. If this crashes in a similar way, I recommend contacting the Turbomole support.
Best,
Antti