First I tried the HDMI/Mini Display Port (single cable) from my 2011 Mini to my monitor and it did not like that one bit. It worked just fine from the Thunderbolt port on the current 13" MBP with SL. Not sure what the story was there so I just decided to use a spare DVI/HDMI cable I had and hook that up with the DVI/HDMI adapter that came with the Mini. Not sue if this is a Lion issue or not.