Good old windows 7 32 bit here and selection via timeline after select all works and selecting tracks or unselecting tracks seem right here too.
 

I see I have a number of posts to read through since my last in this thread...

But for the moment I just want to post that I just updated my DAW and tested this and all is well there too (I rooted my wn8 laptop running fine earlier)...

My DAW is running on win7Pro x64 under bootcamp on a MacPro...

I can drag the timeline to select the time range, then select the tracks to include and my exported fle is exactly what I expect...

Individually via ctl-click or click-dragging over the track numbers...

Keni

Bill Jackson [Cakewalk]
Pretty sure it's not registering the mouse click in the right location. 

Yeah. You can't tell what's going on in the first video cos it's off screen. But in the second video when he clicks on the track number the number doesn't highlight. 

Doktor Avalanche
Thoughts out of the blue... Probably none of them however..
 
1) When starting a new project make sure it's a blank, i.e. No template.
2) Try a different screenset. Try reverting a screenset.
http://www.cakewalk.com/Documentation?product=SONAR%20X2&language=3&help=WindowManagement.8.html#1204251
 
3) Longshot.. Try deleting your picture cache.
4) Remove any third party mouse software (not drivers).
5) Disable antivirus/malware protection - might have an antikeylogging app.
 

Already ahead of you, tried all those.
No difference.
Scheduling a call with Bill Jackson.

Just now rebooted Win7 in safe mode-no networking, no difference.

Bob, it's working here as expected.
 
But I did notice that when I click on a number to add to the selection, it doesn't light up until I scroll the veiw up or down.
Try that and see if you get the same results.
 

I've just installed the Gloucester update and checked single and multi clip selection by left-click dragging and via the timeline without issue.

Breakthrough!!!
If I click on the absolute left most edge of where the track number will be highlighted, I can select multiple tracks like before, it seems that the hotspot of the track number is reduced to only about one or two pixels wide...

Here's a video of the reduced hotspot area:
https://www.youtube.com/watch?v=i1zBQx240RA
 

So, really focusing problem. That can also explain why you could select in previous version: while clicking on "empty space" the click was transfered (shifted) to the "number" area.
I hope CW can find out why you have that shift and either it is Sonar related.