Single Site installation - new
Using SimpleMarket -- had Pages displayed in Standard sidebar widget.
Enabled Membership Premium in Membership dashboard and Pages disappeared from sidebar.
Recent Posts remained visible.
No membership categories or other settings have been setup yet.
Disabled Membership, Pages display again in sidebar.
Password Protect Selected Content plugin installed but not enabled.
ASKED AND ANSWERED ---- Because I had not done the basic levels before Enabling, it caused this conflict. Lesson, read the manual before enabling!