Howdy,
After the recent update to build 9926, I've faced issues running this build of Windows 10 Technical Preview in a virtual machine on my Windows 8.1 setup.
I can't connect to this Windows 10 machine from Hyper-V manager. The miniature screen of the VM display in Hyper-V Manager works fine showing some picture of the VM screen, however when I doubleclick the thumbnail, the opened connection screen stays black for forever continuously showing Connecting to <MachineName>...
Once in a while the screen gets refreshed, but after that the same black screen shows. Sometimes Windows 8.1 (the parent Hyper-V partition) shows messages that Windows remoting to Windows 10 failed.
What could be the