Illustrator CC2020 home screen Preset icons display issue on MacBook Pro 2017

I'm running updated Illustrator on a 2017 MacBook Pro and an iMac (only one computer at a time), both on Catalina, and since the last couple of updates my start up screen (Where you can open recent documents, create a new document etc. whatever you call that screen) has shows the White new file icons in the middle of the screen (attached).

It does not affect performance or use - just a visual bug, but wondered if anyone is experiencing the same problem?  It happens on both Macs but attached is the MBP screen shot.

Thanks!

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