Clips in projects with many tracks jump upwards when snapping

Reported on Windows XP, and confirmed by me on same OS. 

To reproduce:

* Generate 32 tones of 30 seconds each (generating and duplicating
   will save time)
* Edit > Select > None
* View > Fit Vertically to see what you're doing
* Navigate to the bottom track and drag its clip rightwards past the end
   of the clip above
* Very likely, when the snap to the other clips above occurs, the clip
   will seem to "disappear". It hasn't, but it's jumped many tracks
   above.
* If it does not reproduce at once, dragging a few more clips should 
   do so.   

Seemingly, the more tracks there are, the sooner it will reproduce (I 
cannot reproduce with less than twelve tracks). Direction of drag is
irrelevant. If you start dragging at the top, those clips don't seem to
have any problem. The clip can be restored with Undo, but will now
always jump if dragged.

Any confirmations on Mac and Linux please? 

Gale 

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