Dear Angel4585 .
Sorry for writing in English, but my way of "rechtschreiben" probably would make it worse (:
I've not seen this behaviour of datamodules becoming corrutp automagically happen from within the
IDE, but there must be a bug somewhere.
I'd appreciate if you can find out steps, and post them (including the affected Delphi version) as a comment to my blog post:
http://wiert.me/2009/08/20/delphi-ti...-the-designer/
--jeroen