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When utilizing Role Caching, an unmanaged memory leak in the K2 HostServer can cause the Microsoft.Win32.SafeHandles.SafeWaitHandle to consume memory while K2 Host Server is running, with or without any processes. This only occurs in certain scenarios and to date has only been seen on certain 64bit environments.
This Hotfix is contained within the latest K2 blackpearl Update. Install the update package to resolve the error.
The latest K2 blackpearl Update is available as an independent installation package which can be found here: http://portal.k2.com/downloads/bp/default.aspx