TestStand Process Hangs on Wait Step

From time to time we have experienced TestStand hanging on a wait step configured for a constant time period (e.g.. 0.2 seconds). The execution will enter the wait step but never return from it, hanging the execution thread indefinitely. The only way to clear this is to break the execution, then terminate, killing all threads and restart TestStand. We all using TestStand 2010 SP1 running on Windows XP but have seen this issue on previous versions of TestStand (4.2 and 4.0). Most of the time we execute these sequences via a .NET operator interface based on the Fully featured example shipped with TestStand, but I do not believe this is an Operator Interface issue, as it only occurs when executing wait steps. Memory and CPU usage look normal to me at the time of the lock up and we have experience this on multiple PC's. Its just like TestStand enters a wait process but loses the plot and never returns.
Has anyone else experienced this sort of issue, or have any ideas on what may be causing it?
Regards,
David

We are still seeing this issue although we had experienced it in Teststand 4.2 (but not earlier versions of TestStand - I have been using TestStand since the days of TestStand 2). There are no post step call-backs or post action steps of any kind. Almost all of our sequences run in single threads. The issue is as far as I can see a lock-up on a simple wait step configured for a time period. The problem is that it occurs so intermittently it is difficult to pin down. For instance we are running nine automated RF test stations, executing tests for up to 4 days at a time. There can be a lot of wait executions over this period of time, as we have to wait for the product we are testing to cool to within a reference temperature window. On average we may see one lock-up in a month, but when it occurs it can kill a 3 to 4 day test requiring it to be restarted - very frustrating for the users.
We do execute via a run-time operator interface based on the NI example with a few modifications. However, we have never had any problems running this, and as it is the wait step causing problems I cannot think it is just caused by the operator interface.
Regards,
David

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