Alright, all day I've tried to fix it but it didn't work.
I can't erase the videos from my "Subscriptions" module. I click on the "X" (when you put the mouse arrow, it appears an 'X' but I'm pretty sure anybody knows that already) but it doesn't erase them. Then, I've clicked one of them to see if it disappears if I watch it. I've returned to my homepage and it was still there. I've refreshed the page and... still there!!
Does everybody has this problem too? It's annoying.