MTCMusic - Not sure if this is fixed yet, but try registering your iOS Exporter on these forums (like you did with MMF2). This will give you access to the Owner's Lounge for iOS Exporter where you can download the latest Beta. If that doesn't fix it, you may have to mess with some files in Xcode:
In Classes > Extensions > CRunkclist.m
Change this line (around line 188)
fillWidth = ((flags & LIST_IOS_NOTALWAYSFILLSCREEN) != 1);
This should make all the list objects not fill the screen (or you can use 1 to make them all fill the screen)
You just have to be careful to make this change every time you export a new XCode project or Final Xcode (it's fine for Application.CCI exports)
Good luck with your app.