ServiceDesk Plus OnDemand - Probe scanning problems

ServiceDesk Plus OnDemand - Probe scanning problems

I have tried testing out the ondemand version of service desk plus, however, the probe scanning has been only 50% reliable. Frequently, the probe hangs, stops communicating with servers, cannot scan machines, etc....
 
I tested a local install of servicedesk plus as well, side-by-side, and confirmed it is not a WMI settings thing because the local install version had no issues scanning the machines. Targets include Dell hardware, Windows 7, Windows XP, Windows Server 2008/2008R2..... I have confirmed it is not related to the clients because I can scan them with the local install version of Service Desk.
 
Does anyone have the requirements and intended settings for optimum probe functionality? Also, how can you trooubleshoot the probe? No logs and no documentation.... no configuration options other than the register key.
 
Please help... would very much prefer the on demand version.

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