While browsing through my Google reader I noticed an entry titiled "ABENDs after upgrading level of z/OS". The symptom is various ABENDs (i.e. S0C1, S0C4, U0012, U1213, etc.) in the TEMS or in any of the OMEGAMON agents after upgrading your level of z/OS.
The bottom line is when you upgrade your level of z/OS, you need to be sure to apply OMEGAMON Currency PTFs to support that new level of z/OS, AND (let's not forget the AND) OMEGAMON Currency PTFs for any level of z/OS you skipped over. If you skip a level of z/OS (i.e. upgrade from z/OS 1.9 to z/OS 1.11), you need to apply the OMEGAMON Currency PTFs for the level(s) you skipped as well as the level to which you upgraded.
Here is a link to the document, and the document in turn includes links to recommended maintenance levels for z/OS 1.10, 1.11, and 1.12.