What version of Xojo are you using? Are you using any declares? CFURLGetFSRef is a deprecated API.
Also it doesn’t surprise me that it works on some and not others as I had a feeling that the High Sierra (and Sierra) before was doing a crap job of updating the macOS and leaving behind older files, sometimes totally incompatible files, which cause all kinds of weird shit.
Well, CFURLGetFSRef could be used for a function which needs FSRef.
If the URL does not point to a file, this function may fail.
And I really hate the fact that Xojo uses asserts for that as this is common to fail.
[quote=391100:@Christian Schmitz]Well, CFURLGetFSRef could be used for a function which needs FSRef.
If the URL does not point to a file, this function may fail.
And I really hate the fact that Xojo uses asserts for that as this is common to fail.[/quote]
Please file a bug report with the app as a private attachment so we can diagnose it. This shouldn’t be able to happen. The more details on the report, the better.