WinXP sp3 ZCM Agent 10.3.4 - verbose logging for MSI and ZENworks switched ON

I have a bundle with an MSI action for German Adobe Reader 10.1.0 which installs from Repository. Worked

I have added an MSP Action to update to 10.1.2 with the help of an original Adobe MSP for German.

If I install it from repository it never finishes the MSP installation action. I can see that the MSP appears in ZENworks cache directory but it never ever produces an MSI.log file. In ZENworks log I can see
[DEBUG] [03/20/2012 10:52:12.943] [1424] [ZenworksWindowsService] [41] [] [ActionManager] [] [Processing action: MSP 10.1.2 installieren] [] []
[DEBUG] [03/20/2012 10:52:12.943] [1424] [ZenworksWindowsService] [41] [] [ActionManager] [] [Processing Install MSP Action] [] []
But thereafter nothing of any importance - not after 30 Minutes.

If change the MSP Action to install from network it installs fine.