>Just tried it on the NT Sever & NT Work with the same results.

It's normal. The timer it's a hardware resource.

>How can I mess it up? Turn it off & it works fine! <s> Yes the form is definitely subclssed & so are the controls. Wonder if heavy subclassing messes it up?

Don't think so. Heavy subclassing is memory "eater", not timer consumer. Although, it may be interesting to try it on a more powerful CPU. Alpha?! :)

Vlad