>>Any timers around that could switch work area?
>
>Yes, there are timers, but it happens too often just between those lines and nowhere else (in this million+ codeline app).
>I'm beginning to suspect it is a problem that its at the wrong datasession. Still does not explain why it passes the 1st line without a problem.

Well just last week I had a problem where a piece of code would consistently land in the datasession of one of the objects it called, not returning to its own datasession. Happened every time. Then I moved these lines from the init (the whole block containing that call) into a separate method, and then it began working regularly. I had the code repeated, with small changes (aliases, parameter names) to another form, and it still works fine.

Dunno why it happened, and dunno what fixed it.