An Explorer security patches issued last week is causing problems for users testing a new beta version of the browser.

Links come up blank, multiple windows open when the browser is started, or the browser hangs, wrote Jeremy Dallman, project manager for IE security bulletins, on a Microsoft blog on Friday.

The problem comes when a user attempts to run the beta 1 version of IE 7 in "an unsupported side-by-side configuration with a version of IE 6". The Explorer 7 beta version puts a registry key on the machine the first time its execute file is run, and that key will not be configured correctly if an unsupported side-by-side install is used, Dallman wrote.

The key will be removed when the installer is used to run IE 7 Beta 1. To fix the problem, you have to uninstall and reinstall Explorer 7.