Hi ShadowWind Thanks for trying to help :-) - What do you mean by "with a steady stream of movements" ? "click click click" to rapidly, is that it? (english english english!!) Sure when I "calmed down" and saved oftently, I could work a "longer time" with Vue Pro.(What I also did in fact is prepare everything "common" in Vue "standard", then import in Vue Pro.) - Then I'm lost with: "If this is the case, then it's possible the key is considered used by the software and is confusing the system. This would show up no matter how many times you installed and on how many computers." Could you (ooops...) explain this again to a poor one grey cell brain french guy? - But I didn't get another key... - I wouln't want to go back to SP3, as I've installed too many apps which run without problem... - Ok: disclaimer accepted :-))) Then, I'll add again: Vue "standard" works very well...Which is why I'm even more "lost" ... Maybe there is (are) a conflict (conflicts) with other installed software(s) ? I've also shut down every not-usefull Services, and/or all Norton installed stuff (AV, Firewall...), and other rendering softwares, etc. I'm not a specialist, but I saw no shortage of RAM, there was no problem with the registry etc., all I could get was a DrWatson "error file" which for me does not mean much... Thanks again for your help :-) Regards T J