[Bug] Red box on canvas that cannot be removed

Since installing Mac OS “Big Sur” and the latest version of Axure 8 (8.1.0.3395) a mysterious red box has appeared in the middle of the canvas that cannot be selected or deleted.

It appears on all new and existing files and is making the software unusable.

Is this a known bug? Are you working on a fix?

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I have the exact same issue and it appears in the exact same location x=1600 y=1600 on EVERY page.
Fortunately it doesn’t seem to appear in builds, so my clients don’t see it, but it is really annoying as I can’t just cover it over with a rectangle coloured in the background colour or move it to the background.
I’d love to update to Axure 9 but my client’s use 8 and have no plan to update. Please fix