Question / Help Worked twice and now all i get is audio and a black screen recording LoL

Hellz K9

New Member
hey guys,i downloaded obs a few weeks ago,set it up with the some help from a fella on youtube for recording LoL and it worked twice. all i get now is the game audio our skype chat and a black screen. i haven't changed any setting and i have updated nvidia but it just wont work. i have tried other games too like diablo 3 and still nothing, i have no idea what is going on i am not to tech savvy reckon you can help me out?
 
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