>Are they wireless keyboards? I've seen problems when either the battery(ies) in the keyboard run out, or there is interference or a poor wireless connection between the wireless keyboard and the computer.

No, just regular plug in type.

>
>Is there a timer running, or an ActiveX control on any page of the pageframe or underlying form?

There are a few timers that run, but only about once a minute for the smallest time INTERVAL and I've never seen a problem before.....

>
>Any tricky code in the .InteractiveChange or .ProgrammaticChange methods of the problem fields?

InteractiveChange

Thisform.p_Entered = .T.
Thisform.p_ManualUC = .T.

Nothing in ProgramatticChange

>Any tricky code in the methods that fire when navigating from one page to another?

Yes... the tabbing is grabbed by a method that moves the Mouse to a position on the screen (the Tabs of the PageFrame) and click on the tabs to move to the various pages....

>Any automatic saving of field contents to VFP tables or some other backend? Are the fields data-bound, and if so, what is the buffering level?

No....

>
>Any unusual keyboards with their own drivers? If so, have the drivers been updated, and are they correct i.e. don't use a Logitech keyboard with MS drivers?

Dell Keyboards

>
>Finally, delays caused by key logging software ( http://en.wikipedia.org/wiki/Keystroke_logging ) could conceivably cause problems like this. Keyloggers could be installed surreptitiously by malware, or on purpose by employee-monitoring software such as Spector CNE: http://www.spectorcne.com/

We will need to check on that.... I was thinking some processes running in the background that were interferring with the keystokes... just like you mentioned....

Thanks!