I have used includes to insert files into many pages, in some cases the whole content of a page.
Suddenly the includes have been re-written, a space appears. <?php becomes <? php
I've disabled the WYSIWYG editor. The only plugin I've installed recently is Enhanced Menu Editor. Could this be responsible? I've deactivated all plugins but most of the includes just appear as text.
Strangely the includes in widgets are still working. It's a multisite installation and there are includes on other sites still working.
I'm flummoxed! Could it have been 3.8.2 update?