Message Control messages that use Text-To-Speech as sending method are not using the "Time between attempts" setting from the Message Control node in the editor. This can cause messages after the first one not to be transmitted because several attempts are tried at once which very often are not allowed by the modem.
An issue was addressed in the Message Control module. Now, Message Control waits for the time being set in the project.
Fixed on 11.04.2012, available from 7.00 SP0 Build 1