Hi setchemist,
The leak fix is for Win7 SP1 with hotfix KB2964643 installed, for Win8, Win8.1 and Win10.
You can check if you have the hotfix by going to the control panel and checking in the Windows Update section, then Check Update History on the left. You can sort the list by name, it will make it much easier to find the Hofix section.
If you don’t have the hotfix, you can find it here: https://support.microsoft.com/en-us/kb/2964643
Please post back if this helps or if the issue still persists.
We’ll also add this to our FAQ section asap so others can find it with greater ease.
Best regards,
Davidek