Problems with screen sharing

Upgraded three systems to Mountain Lion yesterday (Early 2011 MBP, Mid 2010 Mini and Mid 2011 Mini). 
I rely on Screen Sharing to maintain the two Minis using the MBP.  Now, while the Mid 2010 Mini can be accessed just fine, the same is not true for the Mid 2011 Mini.  After a long delay, a window will pop up but is black.  If I toggle between scaled and full screen a couple of times, the screen will be displayed but will accept no input.  Odd.

I was able to resolve the problem with screen sharing from my MBP to my problematic Mini.
My home network uses a Belkin N600 dual band router with both the MBP and Mini using the faster N band.  After switching the Mini to the slower band, screen sharing began working again.  My other Mini that worked all along was hardwired to the router so was not an issue.
Oddly, with Lion, screen sharing worked having the MPB and Mini on the same N band.

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