Since upgrading our server to Professional edition 9.0.2.0, all file rename operations are failing with “The system cannot find the path specified”. Rolling back to 9.0.1.0 fixed the issue. We have a 2nd Cerberus server running the Enterprise edition 9.0.2.0 which does not exhibit this problem.
[EDIT] 64-bit Cerberus on Windows 2012 R2