You are absolutely right Gerry. This problem certainly seems to be back full time. If someone else could spare 2 mins to confirm this would be a great help.
1. Create a new project using the blank project option.
2. Right click in track view and use insert multiple tracks to insert 50 audio tracks.
3. Scroll down and select the last track, right click and choose 'move to new folder'
4. Now close the folder containing the new track using the ' - ' symdol on the folder track. The track view will jump back to the top of the screen
5. Scroll back down and open the folder again using the plus symbol.
6.Close the folder again. Track view will again jump to the top of the track list.
I have removed all controll surfaces, have no altered or locked screensets and the problem persists.
If others don't have the issue we can continue to search for a system cause.
Apologies for the post hoc red herring!