I have some trouble making my own theme build on modus. Turned out it was a bug in Piwigo preventing me from activating my theme. And thus making it look like my theme didn't work (Bug is reported to GitHub).

I have now made it work. But not in a nice way. I had to copy ALL files from Modus to a new theme. Setting 'parent' => 'modus' in themeconf.inc.php does not work. Because I had to copy functions.inc.php and make changes to it. And thus this file is loaded from both my theme and from modus, which throws an error.

The reason I had to change functions.inc.php is so my theme's settings is saved in the DB under a new name.

All this trouble might be prevented by making the Modus theme save it's settings in the DB under the name: directory-name+'_theme'. Instead of the hardcoded 'modus_theme".

I am sadly not good enough with PHP to program this myself. But I hope someone might find this an easy task :)

Have fun, and keep up the good work.
/Djelle