I have several applications I have created. Part of the logic I have used in each of them is to keep up with who is logged onto the particular app. A table in each app records the machine-user id and datetime when the app is first started. The record is deleted when they quit the app.

Here's my problem this particular table in any given app will for no evident reason dissapear from the folder where my tables are stored. It will still be listed in the project but no file can be found. When this happens no one can log on until I delete the table and re-create it.

Any ideas.