>>I am also using VFP6 SP3 and have not had problems with the class browser.
>
>What OS are you using? AFAICT, it's a huge problem with 98 but not with W2K or NT at all.

Not quite... I get it in NT on occaision. Well not the BSOD, but a C5 error that kills my VFP session.

I get it typically when I'm reorganizing vcx's with drag-drop between 2 class browsers, OR when I launched more than one class at a time by double clicking on a method name (seems once I save the second or third class launched that way and focus returns to class browser I get the hit). But saving grace is despite the occaisional class browser related C5 tango, I've never had it corrupt a classlib nor lost anything.