Youtube doesn't play in Safari sometimes

Sometimes when I hit play on embedded youtube videos, the youtube box turns black (no controls appear) and no video plays. But sound starts. The problem appears at different sites and even different iOS versions (it was on 4.x and now I have 5.0 then 5.01 and it is still here).
The problem solves by reloading the page and starting video once again. Sometimes I need several reloads.
No jailbreak installed.
Does anybody else have the similar problem?

The direct link to an installer for the useable version solved the problem.
I have the the version 12 plugin on my not recently updated external backup disk, but I put the copy in the Library of the the system folder, not in the Library of the root level of the actual startup disk. The installer did it correctly, and J just now found out about the two different Libraries.
Thanks for the help!
Klaus

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