I'm having trouble getting TotalCache to play nicely with the Geo Mashup plugin. Geo Mashup inserts a Google map in the page as an iFrame. All works normally at first, but after several minutes (around 15-20 mins or so, generally), when I load the page all of the maps get replaced with an iframe of the front page of my site. Emptying the TotalCache cache corrects the problem, but it reoccurs again after several minutes.
This happens for both signed in admin and anonymous visitors, suggesting to me that it's not a page cache issue (I have it set not to cache for admins).
Is there some way to exclude iframes generically or some other settings I should try?