EDIT: has now been corrected in 2.2.1 which has just been released
As always there must be somethings that doesnt work. If you are running SwirlyMMS2.2 on iPhoneOS<3.1 then you cannot pick an image from the cameraroll. You can still snap the pic from within SwirlyMMS2.2 and select that one. A fix is already submitted to Ste and will hopefully come out sooner than later.
Sorry for the trouble.
/MB