I was having many issues after the last OTA and got mine to cm-11-20140609-SNAPSHOT-M7 last night. Mine was at 7.4.9 also. I followed rootjunky youtube videos to get mine re-rooted, flashed and working. After getting it rooted, he uses Fire Flash app to put twrp on the Kindle. I deviated a little and put the twrp 22.214.171.124 version other than that, I followed to a T. Once I got all that done, I went on the internet to Hashcode's repository and downloaded the newest cm-11 UNOFFICIAL he had listed directly to the device. I downloaded the latest Gapps from cyanogenmod and then booted into recovery(twrp) and installed. Everything is working beautifully now. Everything seems faster and smoother so far. I did go ahead and do an update from the about area in the settings to cm-11-20140609-SNAPSHOT-M7. I was also able to get all my books that I had purchased through kindle in the kindle reader.