You have a computer that has Microsoft Visual Studio 2012 Release Candidate (RC) installed.
You create a Visual Basic workflow application or a .NET Framework 4-based Visual C# workflow application.
You try to type inside an expression field in the Workflow designer.
In this scenario, a completion list does not display. Additionally, you receive the following error message:
An exception has been encountered. This may be caused by an extension.
However, if you dismiss the error message and try again to type inside an expression field in the Workflow designer, a completion list still does not display, and you do not receive an error message.
This issue occurs because of a change in the presentation layer of the completion list. In this case, Workflow projects cannot create and display the completion list correctly.
A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.
To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft website:
Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.
To apply this hotfix, you must have Visual Studio 2012 RC installed.
You do not have to restart the computer after you apply this hotfix if the affected files are not being used. We recommend that you close all Microsoft Visual Studio 2012 Release Candidate-related components before you install the hotfix.
Hotfix replacement information
This hotfix does not replace a previously released hotfix.
The global version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.