You probably just need to update or change your permalink settings.
Permalinks control the address structure of your site, if you use a format other than post-name or custom structure with the value “/%postname%” the client login page and the form templates will not load.
Also the page urls just look much cleaner using this setting.
Under the settings tab –> click permalinks.
The permalink structure needs to be set to either post name or custom structure.
http://codex.wordpress.org/images/a/ad/permalink-settings.png
My permalink is /%category%/%postname%/
Sorry Nicole, it might not work without some mods to the code for this plugin or following the same structure as me. Let me see what I can do to make it work with other permalink structures. I could make an option menu that might allow you to define a custom structure. No promises, but it does work without categories. Maybe consider a MU WordPress setup and use it in a seperate install altogether. You could always iframe it back to your main site.
Maybe like how buddypress has you define where the necessary pages are located?