Membership not allowing levels to be created

Another problem!
Although Membership installed OK I couldn't access as didn't show up in menu.
On livechat earlier was told to install the "beta" version and ensure my user nnickname was correct in membership config.

Done both. Installed OK and it's now in menu. Can change some elements BUT cannot create any Levels. The only option is the Add New button but it does nothing.

Help. If I can't get this to work I'll have to install Wishlist Member - any known problems with that & BuddyPress?