Error Popups when trying to edit a page

In PBwiki 2.0, every time I click on 'edit page', regardless of the page, I get a series of popup windows; the first one:

Are you sure you want to navigate away from this page?

You have unsaved changes. Continue and discard those changes?

Press OK to continue, or Cancel to stay on the current page.

then, selecting either OK or 'Cancel' will bring up the following popup:

Internet Explorer cannot open the Internet site https://wikiname.pbwiki.com/pagename?...

Operation aborted

After clicking OK on that popup, I get a blank html page.