We have a temporary fix for anyone who recently updated to the 8.1 version of Windows and registration is no longer working. You'll have to make sure to update both your HM2 to the latest 8.1 fix version, and LB. The HM2 Win 8.1 fix is located here:
http://forums.holdemmanager.com/hm2-...nsing-fix.html
The LB HM2 NL Fix is here. Download and unzip:
http://acepokersolutions.com/files/LeakBusterNLHM2 - Windows 8.1 Fix.7z
Then copy and replace the existing LB file that is by default located here:
C:\Program Files (x86)\Holdem Manager 2\Modules
We'll have an official release soon.