thanks norman and amitev for your replies.

norman, when double-clicking i can see (using firebug) that two requests are 
being sent to the application server before any response is received.  
furthermore, i don't see any errors in the server log that would suggest a 
double insert/optimistic locking.  yet i still get the same "the conversation 
ended, timed out, or was processing another request" error message.  in this 
particular case, i'm posting back to the same page in the context of a 
long-running conversation (simple "save" functonality that does not navigate 
away).

i had been setting no-cache http headers to force refresh of pages (via a JSF 
phase listener), but i disabled these headers thinking that perhaps they are 
complicating things.  the one other thing that's odd is that i can see that 
even with single-click requests, action methods are being called twice.  
however, this has been the case for a while and we haven't had any other 
problems (e.g. optimistic locking) as a result.  we are using keep-alive 
connections, but i wouldn't think that should have any impact.

just as a sanity check, if i am seeing multiple requests from the browser 
before any response, would you expect the error message i'm seeing?

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