Are you running the applications on XP pro?

If so, it has nothing to do with the Cute Editor.

XP Pro has a limitation of supporting 10 concurrent inbound connections. 

If you have a page called index.html & you have 20 graphics on the page, from IIS's Perspective, at least 21 connections will have to be made to the server.

Each time your browser hits a given page, it also takes 2 connections from IIS. If you have muliptle windows open, I can see you running into issues very easily.

If you keep refreshing the index.html page, first you will get broken images. Then you will get the following messages:

"403.9 - Access Forbidden: Too many users are connected
Internet Information Services "

Hope it helps.

Keep me posted.