Omegamon II for IMS CUA and Classic exceptions used to monitor the number of active threads, don't wake up. Exceptions names are THHI (Displays if the number of active threads is > nn) and THLO (Displays if the number of active threads is < nn).
THHI and THLO don't fire even if IMS command /ims display thread active shows that there are active threads. PTF UA66234 is applied.
Resolving the problem
THHI and THLO only work for DBCTL threads.
You may check which types of regions are running by using the following sequence of Omegamon Classic commands: