While it is a good assumption it is not correct in this case. The fonts are all stored in a seperate directory on the remote at all times regardless of how many are used in the RCC file itself, and they are not loaded or removed for any reason.
I dont have the latest MX-Editor (after the Control Suite lockdown) installed so it might have changed at that point, but that was not the case up till then.
As for why you are now missing fonts, I couldnt tell you. Under normal circumstances, I would suggest a factory reset, but that doesnt reset the fonts unfortunately.
Believe me, I have tested and tweaked about everything I can find in the remote for the very reason you give there. Creating more space for things such as DMX-3000.
Christopher: I will send you an email this evening with a file and some instructions on how to fix your missing font problem, or can call if you want to email me a time and number that is best to reach you at after 5PM Central.