I checked, but there was nothing on the NAV server event viewer related to this error. The server continued to run, it was the workstation instance that quit responding. Below is the additional details of the workstation error...
Problem signature:
Problem Event Name: CLR20r3
Problem Signature 01: microsoft.dynamics.nav.client
Problem Signature 02: 7.0.0.0
Problem Signature 03: 51fa46f4
Problem Signature 04: mscorlib
Problem Signature 05: 4.0.0.0
Problem Signature 06: 517a1c71
Problem Signature 07: 22b
Problem Signature 08: 10
Problem Signature 09: System.InvalidOperationException
OS Version: 6.1.7601.2.1.0.256.48
Locale ID: 1033
Additional Information 1: 0a9e
Additional Information 2: 0a9e372d3b4ad19135b953a78882e789
Additional Information 3: 0a9e
Additional Information 4: 0a9e372d3b4ad19135b953a78882e789