How to resolve Missing Fonts issue

For most fonts there are different versions of them with the same name. For example, if you were to activate the Open Type version of Gill Sans but the version that your job is looking for is the True Type or Postscript version then they would not automatically replace the same named fonts in your document. You can select one of the missing ones and then go to the Replace field and choose the version of Gill Sans that you have with the one that it is asking for and it will replace throughout your document. Be aware, though, that tracking and even leading might not match perfectly. In the case you show in your second screen shot the fonts are probably either the True Type or Postscript versions of Gill Sans because the Open Type versions (the preferred kind of fonts since they are cross platform) usually have either Std or Pro as part of their name. If you check your version of Gill Sans and it has the Std or Pro in the name then that would explain the problem. By the way, I've seen that with Gill Sans in particular that there is not a "clean" substitution in terms of leading and tracking when replacing one version with another.

Hmmm.  That could be.  Let me investigate & post again shortly.  Thanks Mike!

Installing the missing fonts should have made the problem go away immediately. Maybe it is an older version of the same font name?