In our requirements doc for Agile we specify this as the client monitor resolution. 1024 x 768; 1280 x 1024 (recommended) If you have your monitor in 1024 x 768 which is the minimum you can't use Firefox and use the New Project Wizard.
In my case on the Integration Settings screen I didn't have the correct Mashup Endpoint specified . You may see an error like this in the log indicating a problem with the endpoint. 26 Aug 2011 08:14:31,904 [MashupEvents] (null) ERROR 14 -