Since wordpress 4.2.2 update: I have identified a conflict with rtMedia and the Instamember plugin. Everything works fine on the site at https://mikode.net with either of the above disabled. When both are enabled the site looks fine for logged out users. As soon as a user or admin logs in all pages sitewide turn blank with a 500 internal server error.
I feel sure this is an instamember plugin problem - not rtMedia - however support for premium instamember is not responding.
Does anyone here have any suggestions for a fix?