If you can login to the EBS and cant launch forms, then I probably think it is due to bandwith issue.
Please let us know whether the form does not respond or is it that you get any error message. If you receive get any error message, provide them here.
What is your application release?
If proxy is required, then you will need to set it in the browser and in (Control Panel > Java > General tab > Network settings > Use Proxy Server).
HI, could it be a corporate / browser pop up blocker? ive seen forms stop launching due to this before.