I am having a similar issue. Upon installing Service Pack 19.1, I can serialize everything EXCEPT UBEs.
Initially, I was receiving an error in the jdedebug.log stating it couldn't find F98305V, so I generated the file and that error has disappeared. Now I run the generator and I receive absolutely no error messages, it just says "Generating report XXXXX' whichever report it may be that I am attempting to generate.
I found a few documents stating that I should re-generate F983051 and F98305V. I am not quite sure if they mean to re-generate it within eGenerator or physically re-generate the table. I can't believe they would want us to re-generate the F983051 table as we would lose all of our version entries!
Previously, running SP16.1 there were no generation issues at all.
OneWorld Xe Update 4, SP19.1, AS/400 V5R1.
Thanks for any help,
JM