Hello,
I know that several 'compiler errors' were fixed in the LabVIEW 6.0.2 update. You can download this update from the NI website. After installing the update I recommend you perform a mass compile of your VIs. You can learn more about mass compiling in the LabVIEW on-line help.
If after mass compiling in LabVIEW 6.0.2 you are still having problems, please let me know...if possible, please attach a simple VI that demonstrates the problem.
Have a pleasant day.
Darren N.