How can a background thread hang the UI thread?

Question

I am using a background thread to initialize an instrument over USB. The UI hangs when I try to open the device. I would expect the background thread to pause when calling O

Answer 1

Does meter require running in an STA? Is the call to Open() actually being marshalled back to the UI thread for this reason?

You can verify this is true by looking at the callstack of the hung UI thread in the debugger.