I'm working on a pre-production ZCM system and I'm seeing a strange problem where the Application Window stops launching bundles after a while. Everything else seems normal - you can click around, right-click, refresh etc but bundles simply won't launch. They fail silently.

I've just upgraded from 10.2.1 to 10.3 and the problem still exists. Some of the bundles were migrated from ZDM7 and some are new.

Any ideas on where to look?