Sorry not possible to guess which version of Music Maker you are talking about.
In your case there seems to be two possibilites for this problem; 1. Some thing changed on your computer. 2, some how Music Maker settings got disturbed.
In case 1. if your Music Maker is registered go to Magix website and update. Also check if your version need any Mp3 activation or not. Hope you are using purchased version but not trial.
In case 2., try resetting the program to its default settings File-Settings-Reset. Note: if you have changed any settings according to your needs that will be return to default therefore, please write them down some where before you proceed.
Same here - started Apr 7th in USA - Music Maker Prem 14 - no export functions - no red bar movement, no time bar functions. Tried resetting all - no good - still no export functions, no time functions, no moving red maker.
Others have same issue, on same date - not a user caused action - no new update from Windows.