It was too much a problem to have that theme. it was the reason for jjongsma to create 3 accounts. I removed that uncomplete theme and removed matrix.css in prefs of 4 people, I warned them by mail that they can now use their account. Other personnal css created by tiki-edit_css.php should work (cynt-denisdanniels.css works, even if it's odd because unfinished theme 😊
I hope that Zaufi will soon bring us a new Matric.css ! 😊