problems running version 5.1 vi's on version 6i, the computer freezes after loading all vi's.

[frankd]

I have both 5.1 and 6i on the same machine, 5.1 will run the vi's but 6i then freezes on the same vi's.

[Jeremy Braden]

Try upgrading LabVIEW 6i to 6.0.2. You can also see if LabVIEW 7.0 evaluation has the problem. Finally, you may need to isolate the VI that is causing the problem. It may be corrupted and require copying its block diagram to a new VI to fix the problem with upgrading.