problem with forum navigating and display

since the recent upgrade, it seems whenever i am in a specific thread, and i hit my 'back' button on (IE 5.5) browser, i get what looks like 'raw' code instead of formatted display. at that point, if i hit 'fwd' button, i get the prior page, and this display is not 'raw code' but is unformatted. i think my settings are ok. any ideas?
i can email a screen shot on a word doc if admin wants to see it. just pm me the email address.
tia , john

thanks , j.







