As I said in a previous post, Beatrix code works OK. Its problem is that before accessing a file a permission is needed and after accessing it has to be released (in Jim’s code: SSB.start and SSB.Stop): something I’m not able to implement.
So I went back to Jim’s code and I found that, in the SSB module > Structures > Range, if you remove “start as int32” and “length as int32”, and replace them with “start as integer” and “length as integer”, everything work all right. I cannot say that that “is” the solution, but at least it works.
I agree there is way too much misinformation here.
BTW, I wonder if all these difficulties have anything to do with the fact that the Xojo IDE itself doesn’t open projects from the last session? If you shut down the computer with Xojo project(s) open, on restart Xojo will open, but the projects don’t open with it. They really should, because that’s the expected standard behaviour on macOS.
Anyway, I haven’t been able to give this any time, but whenever I get it all working I’ll try to put some kind of summary together.
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@Aaron_Hunt I’m sure that would be very appreciated by the whole community. 
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