The error you are referring to (Uncaught ReferenceError: FlaggedRevs is not defined) is not relevant to this problem. Looking further into my error console I see a bigger fish just above that one:

Failed to load resource: the server responded with a status of 404 (Not Found)
http://bits.wikimedia.org/w/extensions-1.17/FlaggedRevs/client/flaggedrevs.js?87&301-3

There is an issue with Wikimedia's -1-17/1-18 set up.

This was tested pre-deployment and worked fine however that was on 1.18.

Hm.. changing the 87&301-3 in the url fixes it.

http://bits.wikimedia.org/w/extensions-1.17/FlaggedRevs/client/flaggedrevs.js?foo

Cache pollution ?

AFAIK nothing FlaggedRevs was deployed on dewiki and it is still running MediaWiki 1.17. I'm not sure why this would break.

Actually, in 1.18, this fragile (due to load order) mix of inline and non-inline JS will be gone.

Seems to only affect european users, or otherwise a selection of users.

Created attachment 9138
http headers and html content of error

Attached:

Note that it's showing a Wikimedia-wiki style error, which are not enabled on bits today

Created attachment 9139
http headers and html content of working url (different query string)

Attached:

Created attachment 9140
http headers and html content of working url (different query string) - cache hit

Attached:

Robla suggest not to nuke the cache of this one just yet to allow investigation to cause.

I suggest we bump wgStyleVersion instead so that atleast de.wp is able to review revisions again!

(In reply to comment #9)

Robla suggest not to nuke the cache of this one just yet to allow investigation
to cause.

I suggest we bump wgStyleVersion instead so that atleast de.wp is able to
review revisions again!

That actually works for you?

I'll bump the version per comment #2.

Fixed. Visiting the original url [0] loads the correct version now;

[0] http://de.wikipedia.org/w/index.php?title=Hinschenfelde&diff=80985219&oldid=80975076

http://bits.wikimedia.org/w/extensions-1.17/FlaggedRevs/client/flaggedrevs.js?87&301-4