That's odd!
Could you identify the "plugin" perhaps?
YoutTube embeddings are still the old style (flash player embedding) on DIYGK
and that was never really implemented on iPhones (well not since the iPhone 3GS that is)
but my iPhone just converts them to html5 (well yt does when it recognizes the useragent) *shrugs*
could it be you changed your phones useragent at one point in time?
ORR let me start from scratch:
what phone (model and best OS version)
what browser (default or third party app)
any web enhancement/proxy/setting changed recently? (if so, what and how)
and what happens if you disable vpns, proxies and stuff alike for testing?
if you use tapatalk and you had the issues after updating the app,
check the website w/o tapatalk and (if possible) revert to a previous version until the bug is fixed.
PM didn't work?!

I just PMed with Paul the other day... no issues... *shrugs*
You got an error message? (what did it say?)
that's probably a good idea anyways.. if you get an error message, make a screeshot of it (or write it down exactly) and quote it here, we might be able to see where it's coming from.
'sid