thanks, that's what I was after, something new that would make it not work.
I am the author of one of the theme and have contacted the other author. I will work on fixing it tonight and if I need help, I'll post it here)
thanks for showing me the commit.
EDIT: all done, there was 2 lines to modify. it was the change from &ffw and &rew (which would only function with a long pres) over to the new ffw,long_pres and rew,long_press
There are a lot of new functions, sometime after my exams I should experiment to improve the theme
Anyways thanks again, all works fine now