This has occurred in Firefox 3.6.17

Not likely a common scenario but if I tick the vote box on the first edit of the page, then reload the page the "Vote on all edits" box gets ticked with the same vote.

This appears to have another strange effect which causes a change in the same top edit to apply that change to all edits below.
So far I haven't been able to reproduce that effect consistently though it has happened several times. The initial issue is consistent.

Unfortunately this box only has FF and the old IE6 which I assume you know IE6 is completely unusable. No vote boxes even appear