Hi,
I have tha same problem on my sepm 12.1.4023.4080 (12.1.4a).
I have about 10000 clients and 2000 are not reporting IPS defs (not available).
the clients themselves (on the computers) are green and showing the latest IPS defs.
I've notised the issue after the 03/21/2014 r11 defs of IPS.
things I've tried:
1. go back (via live update policy) to the old defs (03/21/2014 r11), the clients updated and than back to the lastest defs. The clients were good but than got back to not available.
2. Delete clients and wait for them to register back to the manager. The clients were good but than got back to not available.
The clients that are not reporting are XP AND WIN7, and all the sep versions from 12.1.1 to 12.1.4.
hope this information helps, and waiting maybe someone have a solution.
thanks.