I've been getting the following error message every day or so:

Memo File (Form-Name).SCT is missing or invalid.

This occurs after I have been working on a form, when I try to save it. It's not the same form every time or anything, so I can see no pattern.

Now, obviously, the SCT had to exist when I opened the form to edit it, and I can see that it exists, so it must have become invalid.

How can that happen, if I am saving it???