OK, the problem seems to have been quarantine; as in, I knew I needed to remove the quarantine bit on 8.7, but I didn't realize that I had to remove it on 9.1 as well.
At least, I *think* that's what went wrong. Here's what I did: - Removed the old (nonworking) SageMath 9.1. - Re-mounted the dmg. - Copied the application over to /Applications. - Executed /Applications/SageMath/sage. - Lots of messages about something being adjusted. - Crash, no reason given. - I look in a script file and try to run /Applications/sage -python and get a message that python3.7 has a security issue. - I run the command: xattr -dr com.apple.quarantine ../SageMath - Now it works. My misunderstanding was in thinking that the quarantine issue was resolved by 9.1. I *think* that's my fault, and not a bug. -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-support/252b091f-075b-4eb9-872c-b881ffa3ff7co%40googlegroups.com.