Why does moving one clip change the others on the same track?

Sonar X3e b352 on Windows 7 /32
I have a track with 5 audio clips, with gaps between them.
Nothing is selected (CTRL-SHIFT-A)
I click the first clip once to select it.
Using the Move tool, I drag the clip to the right slightly.
The clip moves, but the four other clips on the track also move (by much larger amounts)
 
Why? How do I move a single clip?
 
 

I cannot reproduce this either. I've tried linking 2 clips but that only affects process changes, everything else like moving or changing size occurs independently.

I have tried this several times on new projects. There are different behaviors that occur, but in every case, when I select and move one clip, all the other clips on the track are affected in some way.
The other clips may 1) move 2) change their length or 3) become duplicated
 
I have not done any grouping of clips. I selected "remove selected clips from groups" from the right-click clip context menu just in case, and it does not change the behavior.
 
Here's a screen capture video of the problem. This time it duplicated the other clips.
www.synthify.com/39477281/684268427/Sonar/SonarMoveClip.avi
 
Given that this is reproducible (for me) even when creating a new project, is there any global setting that can affect clip movement like this?
 

I downloaded the video and watched it. It looks like there's something seriously screwed up, the graphics indicate duplicate clips, strange movings, etc. Maybe that's from whatever is making the AVI?
 
In any event, check FastBikerBoys suggestion as that the only thing I can think of. But if that AVI is representative of what's going on and it's more than just clips moving but also generation of ghost clips and such, there's more to the problem than that. Having you updated graphics card drivers lately? Sonar makes pretty extensive use of graphics capabilities.

Repeated drag and drop also results in quite a few track lanes

Craig, Thanks for jumping in. Although the video has some artifacts at the start, later in the vid when I move the clip, the capture is totally accurate. The changes to the clips persists when scrolling or zooming. My video system is relatively old. It is running the latest drivers, but updates have not been released recently. In general I don't have any problems with video and display issues in Sonar. Is there any sort of video "stress test" that can exercise the functions used by Sonar?
 
FastBikerBoy, I think you hit on the right answer.  I did have "Slide Over Old to Make Room" set.  I changed to "replace old with new", and that stops the strange effects on the other clips.
 
That still leaves me with questions, though. Can anyone explain what the "Slide Over Old to Make Room" option is supposed to be doing when I drag one clip? 
If the other clips moved over by 1 measure when I moved the first clip by 1 measure, that could make sense. Or if the clips to the right of the clip being moved were directly adjacent (no gap), and only then would the later clips slide over as needed to make room (as implied by the name of the option). That would be useful.
 
But duplicating clips and changing lengths of other clips?  That seems very non-intuitive and weird.  Is there meaning in that behavior? FastBikerBoy or scook, when you turn on "Slide Over Old to Make Room", do you also see duplication of other clips on the track? I thought it might be some interaction with take lanes, but I have them turned off.
 
 
 
 

I uploaded another video showing the problem, (zooming in and panning to show the duplicated clips are really there, and not just a video artifact.
www.synthify.com/39477281/684268427/Sonar/SonarMoveClip2.avi
 
The next clip shows that the problem is fixed by selecting "replace old with new".
 www.synthify.com/39477281/684268427/Sonar/SonarMoveClip3.avi
 
 
 

Checking back in to see if this has been resolved with Platinum, or if not yet, when? As scook notes above the ""Slide Over Old to Make Room" function seems to be quite broken.
 
In the "Readme.rtf", there is a section titled "Drag and Drop Dialogue Options and Nudge Settings", which is quite similar to this issue I reported last year with clips.