os x 10.10 display settings not remembered
New Mac Pro 12-core running 10.10.2, main monitor is LG UM95 connected via thunderbolt, also a Panasonic TV connected via HDMI to the HDMI port. At every restart, the display settings revert to "mirrored" mode. How do I fix this?
Mac Pro, OS X Yosemite (10.10.2)