Several known issues still on the list to be fixed in future updates.
SwiftKey is pushing out an updated build of its latest beta product, "SwiftKey Cloud", that fixes many annoying issues with the initial release that have been reported by testers. Version 18.104.22.168 makes several big improvements including being able to personalize with multiple Gmail accounts, removal of Android's own backup service if Cloud is enabled and removing redundant SwiftKey account entries in the Android settings menu.
Additionally, many small issues have been fixed. Gmail personalization should no longer crash, Flow predictions are now more responsive, Cloud preferences crashes have been fixed and emoji input in Handcent has been fixed. There are still several more known issues that are next in line to be fixed, but this is still a big update that all beta testers should move up to.
You can grab a download of either the phone or tablet version of the SwiftKey Cloud beta at the source link below.