This indicates a threading issue and it is extremely difficult to reproduce at will.
What would be great would be to allow the user (or my app internally) to grab a stacktrace of all threads or something that will allow me to narrow down where the problem is occurring - on which thread, and what is blocking.
I know that threading issues are notorious, but can you suggest any way for me to troubleshoot this. I'd love to put a big button for users experiencing this problem to press, which will send this useful info to me.
I know this is a very broad question, and not actually related to SmartAssembly, but I'd appreciate any pointers ;-)