Well, both of you aren't providing me with much details here. What fails? Do you see a YT error screen? Does it show loading forever? If it's the former: I'll be releasing 1.13 soon which makes it possible to disable HLS that Youtube started feeding to people in some locations (I cannot get MPEG-TS to work yet, sadly). If it's the latter, there's a few things you can do:

- open the Settings menu, go to youtube.com submenu and make sure 'Allow Media Playback' is enabled. reload the page
- change spoofing to iPad in the same menu
- press pause & play again
- quit Wayfarer, go to Applications/Wayfarer/Cache, delete Curl, Storage, __IndexedDB folders, try again