An error occurred in the print engine - Tool not allowed. File is Read-Only

Hello,

Getting this error when trying to change the paper size of a single sheet in an existing pset. "An error occurred in the print engine - Tool not allowed. File is Read-Only"

Happens to 2 people in my office (so far), but not to me. I've checked permissions, pset file is not read only.

The pset is printing to PDF, the files (dgns, pset and .pltcfg) are all in ProjectWise.

MS 8.11.09.832. 

Thanks,

Tom F