Blocs icon disappears when using the app. After closing it comes back!
Anyone else with this problem?
I have encountered that once. I am running MacOS High Sierra. I have heard others have experienced it too, albeit rarely or only once. No one seems to know what causes it. It’s one of the great mysteries of Blocs! 
The solution is to restart Blocs 
The icon changes in Blocs v4 at various stages, because of that, this really small icon randomly crops up, I tried to find the cause but have had no success yet.
I’ll keep investing.
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I’ve had other apps do this as times. Restart seems to fix it.
It happens to me 100% of the time. I restart my Mac and the App and it’s still the same.
MacBook Pro (13-inch, Intel i7 2020, Four Thunderbolt 3 ports)
Big Sur
Blocs v4.1.1
Have you tried this Fixing the Problem of Missing Dock Icons on Your Mac?
It seems like a OS issue rather than a app specific problem, although I’ve never run into it (yet)
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Good Call. I haven’t tried that yet, but my icon doesn’t disappear - it shrinks down to about 20% of normal size while I’m using Blocs, and randomly. I can use Blocs for hours, and it stays as it should, or it can shrink after 2 minutes, 5 minutes, whatever at other times.
Also, it only affects Blocs 4, not V3 or any other apps.