If you are using the old version of site
builder - SiteExpress and browse with IE 7 or IE 8, you will experience a blue page(or blue
page with a X frame) when you try to edit a page where a page editing
frame supposed to show up. You may experience the same problem if you
are using Firefox.
This is because there is new security setting that blocks the scriptlet.
You need to allow scriptlets to run from IE.
To do so, you need to go to IE menu
-> Tools -> Internet Options. Open the Security tab, add your
SiteExpress url to the Trusted Sites. Then you click on "Custom
Level" button while you have "Trusted Sites" icon selected. You will
find the "Allow Scriptlet" option under the Security section.