When using PSM with TPAM 2.5.910, ensure that users are running Java Version 7 Update 45 32-bit (or above) on their workstations. Check "Programs and Features" to ensure that previous versions of Java have been uninstalled.
For TPAM 2.5.920, this has been revised to require Java 8 or higher.
Java "Security Level" slider should be set to High with "Mixed Code" and security verification set to "Enabled - show warning if required", as in the screenshots below.
If Java Version 7 Update 51 or above is in use, the "Security Level" slider can be set to "Very High".
Java Security Slider:
Java Mixed Code Option: