When previewing a report in VFP9 SP2, sometimes I have this error:

A member object with this name already exists.
Line 0 in frxpreviewform.NewObject():
A member object with this name already exists.
frxpreviewform.Error()

This problem will go away after restarting VFP. Any idea what is happening here?

No idea. I recommend recompiling REPORPREVIEW.APP from the source in XSOURCE to include debugging info so you can get a line number and possibly even suspend and obtain more information.

Are you using any third-party extensions?

- Colin