There have been a few more people with this "xnorm" problem.
It seems to be virus-checker related. If you tell me you are using Kaspersky AV then I would be pretty certain that is the cause as I have had a number of people with the same problem who are all using Kapersky and all got DXTBmp working again by setting the AV options to ignore the actions of DXTBmp.

While Kaspersky seems to be the main culprit it is always possible that other AntiVirus programs may, as partoftheir regular updates, start causing trouble. My programs don`t do anything "nasty" but they do do some things with temporary files that a virus checker might not understand and so block "just to be safe"

Hi Martin,

You are right, I have this antivirus and set it now to a minor protection level, so your programs works like before. Thanks so much, but the strange thing was that it worked before with the same Antivirus. So it must have been the last updates which "protects" too much.

Best
Manfred