Error .the unobserved exception was rethrown by the finalizer thread Opening QB POS V11.

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When opening POS you see the following message:
Unexpected error happened. Please restart QuickBooks Point of Sale.  The error is:
A Task’s exception(s) were not observed either by Waiting on the Task or accessing its Exception property. As a result, the unobserved exception was rethrown by the finalizer thread.

How to fix it

Intuit recommends the following 3 solutions for this problem. The first solution may solve your problem, or you may need to try all 3.

Solution 1: Rename the QBPOSShell log

Rename the QBPOSShell log located at C:ProgramDataIntuitQuickBooks Point of Sale XX.0Log (Win7/Win8) or C:Documents and SettingsAll UsersApplication DataIntuitQuickBooks Point of Sale XX.0Log (Win XP) and try opening POS again.