Problems with WPMUDEV and Divi theme

Further to my ongoing troubles with getting Appointment+ to load on a site.
In frustration I removed all of the WPMUD plugins, including the WPMUDEV dashboard. I then loaded the Appointment+ plugin in separately and to my surprise it worked fine. I then installed another WPMUD plugin (advanced sidebars) and it loaded and activated fine.
Finally I reloaded the WPMUDEV dashboard and I was suddenly locked out of the backend admin with "This webpage has a redirect loop" and reference "The webpage at has resulted in too many redirects."
I then removed the dashboard again and my 2 plugins were accessible. What gives? Do I need the dashboard to run the other plugins? Besides support and your marketing is there any need for it?