Send Message function fails if a user group projected in the global project is used. The CEL shows following entry: "A Send Message function was executed for a group which does not contain any Message Control users!"
An issue was addressed in the Message Control module in combination with the User Administration. Now, user groups from the global project can be used properly.
Fixed on 29.05.2012, available from 7.00 SP0 Build 1. It is recommended to use Build 2 in combination with Message Control if you have this issue because the fix of defect #27010 caused negative side-effects which were fixed in Build 2. Also see #26921.