I use table buffering with a value of 5 for optimistic table lock.
When I'm done, I use a value of 1 to disable table buffering.

It always used to work, but now I get an error when I disable table buffering that says that table buffering is not enabled.

Can USE .... IN 0 SHARED
or
SET EXCLUSIVE OFF

bother table buffering? I can't think of anything else that I have changed. I use table buffering in Edit mode and Add mode and Delete mode. So when I go into Edit mode I am enabling table buffering and then when I do a save I am disabling table buffering after the TABLEUPDATE (.T.) command.