Hello Anthony,
I got the same result after installing .NET Framework package.

Problem signature:
Problem Event Name: CLR20r3
Problem Signature 01: Magnetic Rotary Encoder GUI.exe
Problem Signature 02: 3.4.0.0
Problem Signature 03: 5819e34b
Problem Signature 04: Magnetic Rotary Encoder GUI
Problem Signature 05: 3.4.0.0
Problem Signature 06: 5819e34b
Problem Signature 07: 9c
Problem Signature 08: 38
Problem Signature 09: System.NullReferenceException
OS Version: 6.1.7601.2.1.0.256.1
Locale ID: 1042
Additional Information 1: ed25
Additional Information 2: ed251a9fce7b451e836b62bb1e792f98
Additional Information 3: 87e0
Additional Information 4: 87e088830f594b298b8baf74cc9d42f1
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Please give me a solution to test the "Magnetic Rotary Encoder Reference Design".
Regards,
Kyoungshik