SwiftKey has updated its SwiftKey Cloud app, which fixes up a bunch of problems that the first release had. It is now sitting on version 188.8.131.52, which includes some big improvements.
These improvements include the ability to personalize with multiple Gmail accounts, remove Android's own backup service if Cloud is enabled and removing redundant SwiftKey account entries in the Android settings menu. Gmail personlization is said to not crash with the latest beta, Flow predictions are reportedly more responsive, Cloud preferences crashes have been fixed and emoji input Handcent has been fixed.
You can grab the latest beta version of SwiftKey Cloud, here.