[quote=@DarkwolfX37]
<Snipped quote by Etcetera>

But it's all the same information. Is it really so unoptimized that multiple instances of the same thing can mess with it?
[/quote]

If it's really a caching issue, it wouldn't be the multiple instances rather than youtube eating up too much memory and it being forced to dump a session or something. There are a few options—what websites are affected by the logout?