Logic Pro (X) Piano roll editor bars missing on midi tracks

canalstreet1

Logician
Hey All.
hoping someone can help me out here.
As a songwriter I record midi drum performances from pads and keys.
I frequently edit those performances in the piano roll editor.
In my latest project the piano roll editor is blank on those midi tracks.
The score and step editor function normally but there is no visible data (bars) in the piano roll editor.
If I cut and paste those regions into a new project the piano roll data is visible.
and all other projects are fine.
Anyone seen this?
I work hard to keep my projects squeeky clean so If I can't find a fix I'll probably manually recreate a new project copying everything over one item at a time. (yuk!)
hoping to avoid that.
Thanks
 
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