Re: Problems with Sign up (redirect)
As Enlightenmental1 states, try switching to the standard BP themes. If the problem is solved, then the issue is with your themes.
Also, if you are still using v1.1 of the Skeleton Theme, you need to upgrade. There are important changes in v1.2. If your custom theme is based off of v1.1 of the skeleton, then look at v1.2, find the differences and change accordingly.