>Hi Marc
>
>Thanks for your reply. I do need to do that from time to time and should do it more often. This notwithstanding, the errors still come up. They happen most often when I have been using the class browser heavily or am moving class definitions from one browser to another. Once they start, they tend to come often then never then often ... It's very frustrating.

I am also using VFP6 SP3 and have not had problems with the class browser. However, I do not have VFP 5 installed as well. Still, I would not think there would be a conflict as long as the 2 were installed in different directories. Are you keeping VFP 5 around to support existing apps? It may be worth your while to uninstall 5 and just upgrade other apps to 6 when needed. After you uninstall 5, you may have to reinstall the SP3 to clear out any other problems left behind.