With the 2015 update now my InDesign will not allow me to change a font in a text block once it has been created. It won't let me choose the type font before I create a text block either. My fonts have not changed from the previous update and I keep the program updated every time there is a new one.
See if this thread helps solve the problem:
If it does, then you need to get the update to CC 2015 that should be available on your Creative Cloud application because it fixes that bug.