I had the occasion to compile an old solution (13 projects, ~750 files) using w_fcompxe_2011.10.325
This hadn't been compiled before with this version.
In the earlier versions I had issues with Interprocedural Optimizations, and have my projects explicily say "No" to Fortran | Optimization | Interprocedural Optimization.
Two of the projects were now getting a nasty IL error about not compiled with the same version. This had me going in a loop, since the file it was complaining about was just compiled. After a while, I discovered that this was related to Inter-procedural optimizations, Which I explicitly set to No in the property sheet. On a whim, I added /Qipo- to the additional options. This fixed the problem.
I know, Parallel Studio 2011 XE is old, and I do not expect any fix other than the recommendation to update to Parallel Studio 2013 when it is released, but please verify that when the user says No to IPO, that it means no to IPO.