Navigation popup problems with Opera
I've encountered a number of problems with the navigation popup tool and Opera 8 for Linux:
After showing for a few seconds, the popup expands with between one and five pages of mostly Chinese characters.  I assume this is supposed to be a page preview.
The popup always has a broken image link on the right side.
The popup functionality appears to cause serious problems with clicking on "diff" and "cur" links in article history: the cursor may refuse to change from an arrow to a hand, clicking on a link may do nothing, clicking on a link may take several seconds to several minutes to register.
Displaying a page history may cause the broswer to use 100% of available CPU time.