IE6 update & Javascript support

Has anyone noticed a change in javascript support with the very latest update to IE6? I have clients that say that the javascript window.open() method isn't working for them anymore. The command is just suppressed by the browser so no more popups. These are onclick popups, not the kind a popup blocker would typically suppress. I'm updating my IE to try to reproduce the problem right now but has anyone seen this or found a javascript workaround?

I've seen this type of error only when your users have Windows XP Service Pack 2, which includes a built in firewall. Javascript is blocked by default as you will get a message just underneath the address bar stating that a Javascript was blocked, this includes pop up windows.
What I have done to fix this problem is have my users add the site to the list of trusted sites on IE. This will change will allow any Javascript code that comes from your site without any problem.

Tools->Internet Options->Security
Select Trusted sites and click on the "sites" button. Make sure that the "Require server identification "https for all sites in this zone" check box is unchecked. Add the website to the textbox. ie. http://www.somewhere.com Then click on the Add button.
Click OK To close the Trusted Sites Menu, then click OK to close the Internet Options.
An check marck with trusted site will appear on the bottom right hand corner of their browser for the newly trusted site.

Phew, long post.
This works for me.

yeah, part of the so called Servie Pack 2 for windows XP has popup blocker, which block window.open() commands to prevent all those irritating pop ups in various websites. as far as I know, you can overcome this by adding target='window_name' to your links or forms to make then open as pop up window.

You could also inform that user to hold the Ctrl key and then click the link and/or button

well the target won't work because that's not XHTML compliant so that's why I use javascript to open new windows. This site is also for a large audience so i'll have to find another way to deal with them other than informing any/all visitors that they have to use the Ctrl key.

target no more?? that's huge flaw in the new html then, in my opinion. that means that without js enabled, about 60% of the websites won't work at all, assuming most websites on the net use popup windows for legitimate reasons.