Hi @Hawkeye can you do a video of what is happening to you by any chance?
I will then see if one of my older MacBooks has Big Sur on and if so I’ll try it…but I am doubtful, but I will have a look.
@AdieJAM Just download the bloc that was uploaded called ‘expermenting blocs 6’. Also from the same post, rigfht click and save the image with the bug on the hand. and name it beetle_3_558.
When you open the bloc, it will show you missing files, on the missing file ‘beetle_3_558’ locate it and point it to the image you just saved (with the bug on).
This will load the project and will show you the image with a mask already on. Like I posted. Thats what he is trying to achieve, but his masks seem to stretch across and doesnt look like the diamond mask.
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Hi, I’m back again with two updates.
First, the excellent Blocs support team reckon, and I’d agree with them, that MacOS Big Sur “is on the bleeding edge of support” for Blocs 6, and that the problem I’ve experienced here is an incompatibility with Big Sur. I’m happy to accept that conclusion, so I consider this search for a solution to be over. I’d rather @Norm and the team concentrate on further brilliance for current and future Blocs development!
Second, I should finally have my new Mac Mini M4 by the weekend, having ordered it away back on 4th December! It is on its way at last… Can’t wait!
Thanks to all who posted here. Much appreciated.
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Thats kind of you. But I will still look to address this issue 
Awesome, Im sure you will not be disappointed!
For all who responded to this problem, an update… The problem, using the same Bloc file and the same image, does not exist on my Mac Mini M4/MacOS Sequoia - Image masks drop into place perfectly, fairly certainly confirming an incompatibility with MacOS Big Sur.
Thanks to all who took an interest. Hope this is useful.
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Enjoy your M4, several of my friends have bought Mac mini M4s and all said how amazing it is.