Afraid to install iTunes 10.5

The last time I did a iTunes UPGRADE my audible.com AudioBooks stopped working and I had to contact tech support and get support on resolving the issue. I completely forgot the solution that I did as it was not on their website, and it even baffled tech support at first whom assumed the error message I was receiving was only for Windows users. Has anyone downloaded 10.5 with Audible.com audio books and do they still work? Has iTunes 10.5 caused any problems? Can you still burn CD's or did Apple take away that feature? What features has Apple taken away from us with this release? What new bugs will I have? As a result of the Audible audio book problems, I only buy audiobooks from the Apple store. I dont have as much to choose from, but they work when I do upgrades.

Thanks..