Stock ROM, 2.3.5, Sprint, Root Only.
Youtube Version : 5.0.21 = videos play fine directly via the app when connected on 3G/4G but never on WiFi, error : There was a problem while playing. Touch to retry. - this error just started last month. Cache/Data clears did nothing. I have a Nexus 7 Stock Android 4.4.X tablet that also connects & plays youtube videos to the same Wifi network without a problem. Other data-related apps (e.g. gmail, browser) work fine.
Interestingly, I can still view youtube videos on other apps like Reddit News, PVStar+ Pro (both on Wifi + 3g/4g). It's just when directly loading the youtube app, this error appears. I can search and see content but all I get is that Touch to Retry" I tried uninstalling back to the original stock version of youtube that originally came with the photon and it was able to play via WiFi, but I lose my option to view embedded videos on Reddit News app (needed v5.0.21 to do that).
So I'm rooted + have my MSL if needed to edit anything. Has anyone experienced this or found a better apk version that works?