BuddyPress.org

Along with disabling all plugins except BuddyPress, make sure you are using the default theme that comes with BP.

Distilling your environment down to the least common denominator by testing with only BP enabled and the default theme is the way to determine what is going on. If the dashboard works without issue once you’ve done that, then you know it must be another plugin or the theme you were using. To figure that out, you add one item back at a time. Enable one of the 3rd-party plugins and test. If everything is fine, enable the next, and so on.