Thanks for the replies guys.
I have been intermittently seeing column width changes since October/November last year. I'm glad you have seen this column width issue Jungle
- means it's not just me & my system!
I didn't think I should need to do tabs individually but this has been happening everytime I installed a new beta/new version & after MC has 'hung' whilst loading, so I have done it.
As to lag on MC opening causes -
I was thinking of a windows update or AV update not MC itself.
On both occasions this hang has happened MC wasn't the first thing I opened. I had been using the browser for a bit, the PM is set to hi-perf so no drives should be asleep, no USB drives plugged in & empty opticals.
I wondered about corruption of the SSD but the drive software says says 100% green status & loads of life left...
- Makes me think about a conflict caused by something blocking MC.
Have just rebooted & MC reloaded in less than 2 seconds - normal.... So the mystery continues!