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Meanwhile I've changed php version for your account from 5.5 to 5.3 native. This brought your websites back online.

No clue what this means, I guess I'll search Google.

Alexander S. Replied to my ticket 30 minutes ago saying he was looking at it.
I see nothing in the server error log, despite repeated 500 errors.

Getting a 500 error on at least three of several sites, not gonna check the rest. Been having a problem with 16 wordpress sites.

I notice keep alive does not seem to be enabled on my shared server (charlie)

I manage a website for a client on a dedicated server, and it seems to improve things over there.