Yes, NAI 8.0 definitly harms SCOM Agent script's. They failed or hang, sometimes the hole scom agent ist restarting.
If scriptproxy activated, Nai replaces the vbs and java-script interpreter of the operating system:
orig.:
HKEY_CLASSES_ROOT\CLSID\{B54F3741-5B07-11cf-A4B0-00AA004A55E8}\InprocServer\(Default)
REG_SZ = C:\WINDOWS\system32\VBScript.dll
HKEY_CLASSES_ROOT\CLSID\{f414c260-6ac0-11cf-b6d1-00aa00bbbb58}\InprocServer\(Default)
REG_SZ = C:\WINDOWS\system32\JScript.dll
NAI:
HKEY_CLASSES_ROOT\CLSID\{B54F3741-5B07-11cf-A4B0-00AA004A55E8}\InprocServer\(Default)
REG_SZ = C:\Program Files etwork associates\virusscan\scriptproxy.dll
HKEY_CLASSES_ROOT\CLSID\{f414c260-6ac0-11cf-b6d1-00aa00bbbb58}\InprocServer\(Default)
REG_SZ = C:\Program Files etwork associates\virusscan\scriptproxy.dll
Unchecking the scriptproxy field does'nt deactivate scriptproxying! You have to unregister that dll in the folder of NAI installation:
regsvr32 /u scriptproxy.dll
See http://support.microsoft.com/kb/891605/en-us
Restart mcshield and mom service and your problems are gone (be aware the engine updates can re-registering this dll and the problems come back)
But you have a lack of security. Better you use NAI 8.5 Patch 7 or greater (Patch 7 fixes another huge NAI Problem -> NonPagedPool problems!)
I hope this helps :)
Mario