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>On this form do you have an editbox on one of the pageframe pages? I recall I had this error a while ago on a form with pageframes, some refresh and editbox. I forgot how did I resolve it.

Yes, I do. It's a complicated form, with a form class that is scrollable included within the parent form. The parent form has no pageframe or editboxes, but the contained form class, which does include a pageframe, has several. Having said all that, it works fine on my development machine and on another server running the app under Terminal Services. The C5 occurs only in this one install on another server also running the app in TS.