What causes UnmanagedMemoryStream in WPF (Memory Leak)?

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Profiling my .NET Application shows me that there is a big delta in UnmangedMemoryStreams.

It seems they are created from some resource loading.

Anyone has an idea what can cause this loading or how to debug this?

Screenshots from Profiling:

http://imgur.com/a/eO76W

http://imgur.com/a/eO76W

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Like said in the comments, FontFamily is causing the leak. More details: WPF TextBlock memory leak when using Font