Aquamacs: tramp and frame appearance

hi,

I spend a lot of time in Aquamacs using tramp mode to edit remote files
on a Linux server. Mostly this works very well (thanks David!), except
for one glitch: 

If I leave a file open on the desktop and return to it later, the
session has timed out, so tramp prompts me for my password. After typing
it in, I'm *always* told "file has changed on disk" (which it hasn't),
so I hit 'revert', whereupon Aquamacs also reverts to its default frame
appearance, rather than my prefs for the file's mode.

Is there any way round this, and (supplementary question) why does
Aquamacs/tramp always report that the file has changed?

Thanks,

TimH

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