Debug technique to locate VI which is "hanging"/waiting. Pause button - is not working.

Question

During development I now and then experience that the top-vi simply "hangs". The debug Pause button does not break into the program - it turns red but nothing happens.
I can stop with "Abort button", but then I can't see which vi was stuck in a waiting state - this information is lost.
Are there a way to determine the "state" of sub-vi's in a running application (during development).
like a list:
  A.vi : Running
  B.vi:  Waiting for IO, queue or similar
  C.vi:  terminated
That would help locating the problem.
Any clever tricks?
Solved!
Go to Solution.

Answer 1

Many thanks for your valuable suggestions. I used your suggestion about the running vi indicator with success:
1) Engage the Pause button in the hung application
2) Open block diagram,
3) Find runnning vi indicator (see image below).
4) Open this vi,
5) Engage its Pause button.
6) locate the running vi arrow.
...and so forth down the tree. Except it only works for vi's having dfebugging enabled.
I found the issue with my application - reported http://forums.ni.com/t5/LabVIEW/Continuous-Measurement-and-Logging-Template-May-hang-up-due-to/td-p/....