OOPS, yes that did it! :oops:
Before posting, please read how to report bug or request support effectively.
Bug reports without an attached log file are usually useless.
If I try to upload a .jpg file from my local win2000 laptop with winscp3 3.7.6 I get an disturbed image on the Linux webserver.
(a copy with Total Commander 6.53 from the same machine works fine)