Had very little time today dur to the issue I was talking yesterday. Anyways, it's Fiona in a reversed role situation, hope you'll enjoy!
I found a way around my problem. I had to reboot windows on my working station and re-install all the softwares.
I didn't loose any files, thanks God, but it turns out the problem was a dysfonction of the tablet pen. I'm currently using my old tablet, it's not the best but that's working.
May have to buy a new pen (I hope not) before going back to a more comfortable setting.