Permissions denied in admin dashboard

Hello all,

I have installed the membership plugin and everything worked pretty well, until today. When I logged in to my admin panel I only could see the dashboard, profile, and membership plugin, I have access denied for the rest of the content of the page. Can't see the other plugins.

Lately I have installed the yoast wordpress SEO plugin, the w3 total cache plugin and the xml sitemaps plugin,I don't know if can be any conflict.

Any advice to solve it?

Thanks,

Paula