Consider the following scenario:
You have Microsoft SQL Server Data Tools (SSDT) - Business Intelligence for Microsoft Visual Studio 2012 installed on a computer.
You try to edit an expression of a report by opening the Expression Editor in SSDT.
You press the Left Arrow key.
In this scenario, there is no response after you press the Left Arrow key.
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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
To work around the issue, press the Alt key and the Left Arrow key at the same time.