Well, I did a test : I opened a test file (just the basic template) done in Sonar Platinum in Sonar 8.5. I saved it in Sonar 8.5 and than opened it in Platinum : instantly. So it seems something in the .cwp makes Sonar hangs out. I tried with old files that have never been saved in Platinum and same hang out excepted for files made in 2010 (I think made with Sonar 8.5)..
 
I saved again the test file above in Sonar Platinum and reopened it instantly again.
 
I let the 2 files if someone can test them please to see if it's the file or my configuration : at home, test_platinum.cwp takes a while to open, the other takes 1 s.
 
http://photos13.free.fr/Sonar/test_platinum.cwp
http://photos13.free.fr/Sonar/test_8.5.cwp

I copy/paste what I wrote in the other thread :
 
I find the culprit which is not Kontakt or other plug-ins as in Safe Mode, I click Yes to All and it opens instantly. It's the Browser that makes my files take a while to open (Safe Mode prevents the Browser to be opened).
 
If in a file, the Browser is docked (minimized or not) or undocked but opened, it takes a while. If I undock the Browser and close it, next time I open the file, no problem but if I click on B to open it... long time. Once the Browser is opened, I can minimize/maximize it with B with no problem but if I close it... again a long time to open.
 
It also explains why a file made in Platinum, saved in 8.5 and reopened in Platinum is loaded instantly as the Browser didn't exist in 8.5.
 
I found this but I have no floppy disk listed : https://www.cakewalk.com/...wser-slow-on-some-comp

Solution is here : http://forum.cakewalk.com/FindPost/3553599