FL Twitter and Proxy problem

Am I the only one who has the 403 error with FL 9.1.9? Runs smooth without proxy but when using one I get problems? Before I head over to refresh and ask for new proxies I rather check your opinions (since 4 proxies from SSL Private Proxies don't work on Twitter but do on Instagram).

error i get:
Check that your proxy is working and also check that your Twitter useame and password are correct [useame]

both work, obviously.

Thanks and wishing you all a great day!