It seems that Cydia is crashing at the end of installation. Therefor we suggest that you reboot your iPad after installation. This may also lead to that the icon for SwirlyMessage is completely white. That can be fixed by installing some other app from Cydia (that doesnt make Cydia crash) and then removing it again.
we are working on this Cydia-crashing with Mr Saurik. Stay tuned...
