Dual Display on Mac Pro (2011) not recognized after Yosemite Upgrade

I have  Mini Displayport-to-HDMI adapter that used to work fine until I upgraded to Yosemite (now running 10.10.2).  Now during boot up the main display flashes looking like it 'notices' the 1080 display resolution then quickly ignores it and the HDMI output is not recognized in the System Preferences Display window.  This Mac Pro has two Mini Displayport ports and both behave similarly. 
The main display powered through the DVI port works fine
Any suggestions to resolve ?

Not sure how critical your dual display is to your work life, but if it is you may want to consider using a Matrox product. Google it and search their site for "DualHead2Go" adaptor. I've used their stuff since 2008 when I bought my MacBook Pro. Their software is always kept up to date with the latest Mac OS. I have been VERY pleased over the years. Food for thought if you can't get your current system to function properly.

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