--SOLVED--
I had the 4.7 installed and had been working fine.
As of lately, Cura popped up a dialog to upgrade to 4.9 and I took the bait ..LOL
Installation went through smoothly, but once the UI is loaded and I try loading an object it crashes by sending multiple instances of dialog box with some errors in it.I clicked Send Report, then the error disappear, along with the UI, as if I had quit Cura.
Here's how I got it to work again -- an older version 4.8
https://brewinstall.org/install-ultimaker-cura-mac-osx/
Before you do that, go to Applications folder (Mac OS Catalina) and rename Ultimaker Cura to a different name, just in case you need to revert.
Install Cura by following the link above. It is done through the Terminal. Just copy paste the commands. There are only two commands to run. If one of them seems like several lines, they're actually a single command.
First command:
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null ; brew install caskroom/cask/brew-cask 2> /dev/null
Wait till it finishes downloading. At times it seems like not doing anything be patient and wait for the terminal prompt comes back, at which time there will be some text saying "...successful".
Then run the next command:
brew install --cask ultimaker-cura
Again wait for a success text.
Hopefully this works as a quick fix for those experiencing the same problem as mine.
Voila! Cura is working again, although it's not version 4.9. It's 4.8. I'll take it.
