File is opened. Macros are enabled (option). I open Developer's tab to make appear Complement and I select the macro. After that, I go to the Macro tab and launch it.
I have no other add-in.
I produce EPUB with embedded fonts. These font are Linux Libertine, LinLibertineG30 a fork of the first one, and a small-caps fonts. All these are probably missing on your computer. Could this explain the warning?
Not to be carried away, I understand that the modification of titles and notes styles I observed may probably be caused by some docm template because user styles with specific names are left untouched. Only styles with "generic" names are modified.
As I wrote already, I still have no clue why my EPUB gets a
letter-spacing property encompassing all the body and why the EPUB is surrounded by empty "
Policepardfaut" spans... But these things are easy to destroy.
As nobody stepped forward to make some trials, and as this question does not seem to interest many people, I propose to switch to PM for the rest of your query.