As you may see, I was able to change my user name from my email address to the new name. It also seems to change previous posts to the new name. I will detail this in a separate post because Tech Support told me this new ability was applied just this morning. Talk about a timely change
 
I reported my crash bug with the midi edit to the same tech. I will happily admit I was pleased pink at the helpfulness of Tech Support after only a 2 minute wait to be serviced.
 
He did not have anything on the problem, but he noted that this happened during a standard midi edit to keep a note out there in case there are other reports.
 
He did have me rescan my plugins and strangely enough 3 new plugins appeared. I also reported a plugin naming error in the conversion from X3 to Platinum. X3 listed 'Kontact 5 8 out', 'Kontact 5 16 out' and 'Kontact 5 64'. In the new insert plugin list, I had 3 Kontact 5 instances listed but all named simply as 'Kontact 5'.  He showed me how to edit the names back to the full names through the plugin manager which really allows you to call your plugin anything you want.
 
The issue that really frustrated me about the crash was that I lost 30 minutes of work (of course because I did not hit save during that time), but the frustration was that in X3 I had set Sonar to auto save every 5 minutes. When I returned from the crash it did not offer to select a restore point and therefore I believed that the upgrade did not carry my preference over for 5 minute saves. Well I was wrong. It did carry over the preference. Then I was disturbed that it was not auto saving, but when I looked in the folder I found the Auto Save point (Hurrrraaaah). The only thing was that Sonar did not realize I had a previous crash so it did not offer me the chance to select the Auto Save. I can live with that because my Auto Save meant I only lost 3 minutes of work ... another Hurrrraaaah.
 
At the end of it all, I was so pleased with the support help. He did not try to rush me off the line and gave me some great tips on things I should do to prevent upgrade blues. Thanks CW and great Tech Support.

Excellent news cheers! :)

Same happen to me when I use "Paste Special" ... grrrr.
 

Yup! same here. I was doing some audio loops and needed to duplicate using Paste Special 15 times and bam. HANG CITY. lucky I save like a champ so I didnt loose anything. I think theres a Problem with Paste Special!!!! I'm on Sonar planinum lex. 

I think It 's a memory issue so If you have this kind of error you would have to lower your sampling rate or Big depth or increase your computer memory

How about a new plug-in - CTRL-S ?
 

Lower your "Maximum Undo Levels" in Edit > History

I would say 6 out of 10 of my relatively infrequent crashes are related to paste.   Most recently, exactly as in the OP:  a very simple project, a few hours of fairly simple work, copy, paste special, and crash. 
 
In addition to save -- which, imo, is not always a good option, because it overwrites a known good version with a potentially bad version, bad both in Sonar issues and in the construction of the music -- I find that using 'bounce to clips' with all midi tracks selected is a way to hold off crashes.   Possibly superstition, but I don't think so!  

williamcopper
I would say 6 out of 10 of my relatively infrequent crashes are related to paste.   Most recently, exactly as in the OP:  a very simple project, a few hours of fairly simple work, copy, paste special, and crash. 
 
In addition to save -- which, imo, is not always a good option, because it overwrites a known good version with a potentially bad version, bad both in Sonar issues and in the construction of the music -- I find that using 'bounce to clips' with all midi tracks selected is a way to hold off crashes.   Possibly superstition, but I don't think so!  

I think you're close to the mark. As the clip count starts to go up when slicing up and copying clips around, I've noticed that Sonar can get flaky. Rejoining clips as I move down the timeline seems to keep things stable.
 
Regards,
Dan

dcumpian As the clip count starts to go up when slicing up and copying clips around, I've noticed that Sonar can get flaky. Rejoining clips as I move down the timeline seems to keep things stable.

hey dan, what sort of numbers are we talking here? 100 clips, 1000?