Hello,
What version of LabVIEW are you using? If you are using 6.0, please download and install the 6.0.2 update from our website. Then mass compile your VIs to see if the problem persists. You can read the on-line help in LabVIEW for more information on performing a mass compile.
If, after installing 6.0.2 and mass compiling, you still get the error, then the problem may be with the ActiveX control itself...to my knowledge LabVIEW is much more strict in handling exception errors than other environments like Visual Basic.
I hope this suggestion helps. Good luck with your application, and have a pleasant day.
Sincerely,
Darren N.
NI Applications Engineer