I think I've read enough on this forum to convince me to stick with ver 5.0.677. My PC is a tool that I need every day and I can't spend hours trying to get it to work with uninstall / reinstall, etc.
Looks to me like this latest ver (.899) wasn't really ready to be released.
Don't loose sigh of the fact you are on a support forum and only those with problems come knocking on the door, the greatest majority aren't kicking in the door or boy would you notice it on the forums.
If your system isn't directly related to any of the outstanding issues running AOL software etc. then I would proceed.
I don't spend more than 20 minutes trying to resolve a problem on my system, if it is going to take anything over that I restore my last hard disk image, takes about 20 minutes.
If this system is a tool that you use every day then you need drive imaging software, take an exact image of your hard disk/partition every week, incremental backup images more often and you will never have to spend hours resolving computer problems for whatever reason.
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With almost a month on beta testing and 5.1.864 was released, problems were found and pre-released builds were released up to 5.1.884 before after a time 5.1.889 was released as an official release, so no it wasn't released too soon, absolutely not.
Had you spent more time on the forums during this beta and pre-release phase you wouldn't be saying that. The problem is that with the multitude of users (140 million plus) on different OSes, different security software, different applications, you can't possible test for everything and you simply can't wait until you get zero errors as that day will never come.