CRM Workflow Error with Rollup 2

Ran into a problem with workflow and CRM Rollup 2 today. We were getting errors after attempting to publish any workflow. Turned on tracing and the following popped up into the logs:

Error Number: 0x80045001

Error Message: Workflow compilation failed:
WF1399: Activity 'CreateStep5_policy' validation failed: Property "RuleSetReference" has an invalid value. Rule set is invalid. Rule "main" validation failed. Type System.Globalization.CultureInfo is not marked as authorized in the application configuration file.

Thanks to Tom Cadman on the Microsoft forums for pointing out that this was caused by some missing lines in the CRM web.config:

<!--
    * CRM SE 6681 V4:  Hotfix needed for CRM Workflows before WF.Net security patch
   -->
   <authorizedType Assembly="mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" Namespace="System"  TypeName="Void" Authorized="True"/>
   <authorizedType Assembly="mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" Namespace="System.Reflection"  TypeName="AssemblyFileVersionAttribute" Authorized="True"/>
   <authorizedType Assembly="mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" Namespace="System.Reflection"  TypeName="AssemblyVersionAttribute" Authorized="True"/>
   <!--
    * CRM SE 5934 V4: Workflow Designer and Runtime Do Not Handle Decimal Numbers Correctly
   -->
   <authorizedType Assembly="mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" Namespace="System.Globalization" TypeName="CultureInfo" Authorized="True"/>