At present this a collection of the current bug reports regarding TaviBug:802785 on the subject of display/editing on old version. This page needs refactoring, but I haven't gotten around to it yet...

twiki:Codev/BrowserAndProxyCacheControl? seems like a useful resource. Incidentally, I've seen this problem on numerous other wikis.
The behaviour on the Back button is quite normal (Opera does this much more aggressively) - browsers are allowed to not revalidate pages from history, I think, whereas if you re-visit the page via a link, they should use the cache. If you want this behaviour, you can set the Expires header in HTTP to 24 hours ago (to allow for timezones) and also the Cache-control header (see :twiki:Codev/BackFromPreviewLosesText? - you do run the risk of creating this, so you might want separate caching headers for the Edit page). Also, have a look at :twiki:Codev/RefreshEditPage?, which avoids the 'second edit in session loses first edit's changes' issue. --RichardDonkin
This might have something to do with http pipelining. I had similar problems with pipelining enabled in mozilla. --AndrewJorgensen
I have not noticed this behaviour again with Opera 7.x. Close the bug if nobody else reported it. --HermannSchwarting
Have a look at TaviFAQ where this is discussed and solved