Upgraded to 12.1.3 (from 12.0.6) and the Standard PO template that renders the POs is putting a "u"
We saw this in the test environment as well, but I "thought" our Unix Admins did something to resolve this via an adjustment to a driver (don't ask me which one or how). The Unix Admins are swearing that the drivers between test and prod are exactly the same, and we have this issue now in prod immediately following our upgrade.
I also ran the recompile all XML reports concurrent job, but it doesn't appear to have made any difference.