XF 1.2 lost buttons on redactor_toolbar


I've been searching but can't find how to fix this.

Have been asked to get the forum that hadn't been updated for a long time up to date.
Updated plugins and templates.

All seemed to be fine until I noticed the redactor_toolbar had not readable buttons. It does work, I get the hovering balloon when going over them with the cursor but nothing shows in the buttons
2013-12-19 14.48.39.jpg

I hope someone can point me the way
Brogan, thanks, I'm trying but making things worse.

The actual upgrade was done before I got access so most steps are already taken.

Giving up for now