I believe I ultimately found and fixed the error (with help from others here) and started a feedback case long long ago. Here’s the gist of what I found (from an earlier message in this thread):
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//The Build process did change quite a bit in 2021r1, so it’s possible that something in your //app is hitting a situation we did not anticipate.
Yippee! Problem found and fixed. Thanks everyone for chiming in…Rick, Greg, Paul, Beatrix, etc, etc. The problem was indeed in the build process (and the fault, I guess, was mine). What got me to the problem and the fix was in the latest issue of XDev where I saw this in the Xojo Talk section (written by none other than you Paul!):
“Important Note: One thing in particular is that the CurrentBuildAppName IDE script constant now always includes the extension on macOS. Previously, this was not consistent, so you may need to adjust your build scripts accordingly.”
So, I checked the Build Settings of my two apps…App1 where the build worked, and App2 where the build did not…and I found that the Mac App Name of App1 was set to App1, but the Mac App Name of App2 was set to App2.app…with the extension.
I removed the “.app” extension that I had put in myself thinking it was proper, and now the build for Universal builds just fine.
Again, thanks to all for the help…
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Hope this helps you too…