Hello guys, first of all i'm sorry for my terrible english, i'll do my best not to make you run away by reading this xD
I don't know why, when i try to use Shift for the 90° snap, i think i'm doing the right processus (Hold-click => rotate the camera closer to the view you want to lock => Hold-shift => "release"-click (not sure if that word works here xD) => release-shift, but it just doesn't work at all, the very second i release the click the camera gets instantly unlocked and it's so unbelievably annoying to be honest
I found another way to deal with it like going to the texture menu => plane then select the view i would like to lock but it's an amazing waste of time.
Oh and i've already search for someone who experienced the same issue on internet, and the only topic i found speaking of it was on this forum (that topic is 2 years old so i couldn't just reply to it) and still insolved...
I'm praying to finally meet the chosen one who'll fix that horrible bug cause i can't take it anymore huh
Edit : OK, i fixed it !! i was using a soft called Autohotkey because my mouse had a double-click issue, i just disabled that soft and everything's alright now !