Artboards Glitching - rotating horizontally

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Hi there,

I am having a weird glitch happening with my artboards.

For some reason, my vertical artboards have started randonly flipping horizontally. I will change it back but then it will do it again. Its across all files I open/start.

I can't figure out whats causing it. I use Illustrator daily and haven't changed anything about how I am working. I have done a computer restart. On the latest version of Illustrator, no updates available.

Not sure what else to try?

Thanks heaps in advance!

[Ton Frederiks · Accepted solution]

This has been reported by more users, see here: 

https://community.adobe.com/t5/illustrator-discussions/art-board-keeps-switching-to-landscape/m-p/14...

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Thanks so much!