HELP! ActiveX controls in NT 4

[Karen Breban]

I have happily been developing a LabVIEW application that uses the treeview,
slider, status bar and button Microsoft activeX controls. It works fine on
W2k and 98 but on NT4 the activeX controls react very slowly. When the
program is not running they respond fine, but as soon as the app starts
running i have to click many times before an event registers, why??? The
program itself is still running fine as other parts of the front panel
respond at a sensible rate. Any help would be greatly appreaciated,
Tom.

[Zvezdana S.]

Tom,
Try running your VI in the user interface thread. Whenever you deal with activeX, there may be a lot of thread swapping, so having it all run in one thread would save time.
To change the execution system, go to File>>VI Properties>>Execution.
Also, make sure you have the latest NT service pack. I think they are up to SP6.
If this doesn't help, you may want to post your VI here, or a small example that reproduces the behavior. It is hard to troubleshoot this without the actual VI.

Zvezdana S.
National Instruments