"Error on page"
 

Running XP pro at work, IE6. After a while (on FlyerTalk), about every page come back with the little notice in the lower left corner "Error on page" and "Done, but with errors on page"

The page looks OK to me.

Any idea what causes this?

Might be a popup blocker or ad blocker. I think I see that message at work; they have a pretty strict ad blocker in place there.

I'm assuming you're not seeing any other obvious issues with the page loading. I know that if you accidentally mouse-over the Flyertalk banner (triggering the drop-down menus) you can get an error that prevents the rest of the page from loading.

Double-click on the yellow warning icon. It usually shows you a javascript error. The javascript error might affect the working of drop-down menus and other things that happen after the page is loaded, but it doesn't usually affect the loading and displaying of the page itself. Just my uneducated guess.