5.01 is with the beta testers. Once they bless it, it will be released.
I haven't so far, but perhaps I don't jam long enough with them to get them freezing.
Ah, decisions...
If you are really worried you might want to go to 4 as 5.01 is being tested.
What if some numb nutz like me hasn't been saving previous fw versions when upgrading to v5. Is v4 archived somewhere for public access?
If you need it. I can get it to you.