>After the last compile a form started misbehaving. Tracked the problem to missing code in the GotFocus and LostFocus events of several textboxes. Opend the SCT file and found that the "Procedure xxxxFocus" line for each of the textboxes has several graphical 'boxes' followed by an umlaut 'a' infront of the keyword "Procedure".
>What caused this? How can I recover the code. I don't imagine manually editing the SCT file is allowed.

OK, your SCX crashed - so you better copy the .sct file into some .txt, and then, well, you know, copy & paste. Just start from bottom to top, to get the freshest versions of the text in the memos.