Problems with Installation

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I own a hosting website at Hostmonster and I have installed Concrete5 with Simple Scripts for 3 sites I have hosted there. However, after installing Con5 on each site, I'm not able to login to the con5 marketplace from the Add Functionality page on the Dashboard. I am able to login to the marketplace on other sites I am working on that are also hosted through a different account on hostmonster. Therefore I know it isn't an issue with my con5 login information.

Is there an account setting in hostmonster or con5 that I need to change in order to have the ability to login to the marketplace from the dashboard. When I try to login, I get the error "Unknown
Error: Login Failed".

Hopefully that all makes sense and I appreciate any ideas that anyone might have. Thanks!