One way to avoid LabVIEW 7.0 from crashing is NOT to programmatically change the colors of a Tab page which has been hidden (learned this one the hard way :-(  ).  I had a sub-VI which would set the selected tab's page to a different color than the other pages so that it would be more obvious which page is selected  (check out Apple's web site for a good example of the right way to do tabs).   
I now have to check that the page is visible before setting its colors or LabVIEW 7.0 dies a horrible death (fortunately, at least for software, there is such a thing as reincarnation ;-). 
Just thought you'd all like to know... 
E. Blasberg 
Advanced Virtual Instruments, Inc.