I had to downgrade to 4.2 as well with some of the issues that occurred. The memory leak was a big deal with me.

Another problem was its incompatibility with the Blueant Supertooth 3. It has text to speech so you have to upload your address book for your contacts. It will not upload the address book from my Curve. So I had to go back to 4.2 to get it to work.

Something that Blueant is going to have to work on I guess.