Hi Jon,
Thanks for getting back so quickly.
I tried it with a plain txt file and still get beeps so it's probably not a language service issue.
I copied the contents of my About dialog below (minus some irrelevant pieces). I hope that tells you what you need to know.
Cheers,
Damian.
Microsoft Visual Studio 2010
Version 10.0.31118.1 SP1Rel
Microsoft .NET Framework
Version 4.0.30319 SP1Rel
Microsoft Office Developer Tools 01019-532-2002102-70275
Microsoft Visual Basic 2010 01019-532-2002102-70275
Microsoft Visual C# 2010 01019-532-2002102-70275
Microsoft Visual C++ 2010 01019-532-2002102-70275
Microsoft Visual F# 2010 01019-532-2002102-70275
Microsoft Visual Studio 2010 Architecture and Modeling Tools 01019-532-2002102-70275
Microsoft Visual Studio 2010 Code Analysis Spell Checker 01019-532-2002102-70275
Microsoft Visual Studio 2010 Team Explorer 01019-532-2002102-70275
Microsoft Visual Web Developer 2010 01019-532-2002102-70275
Microsoft Windows Phone Developer Tools - ENU 01019-532-2002102-70275
ApplicationArchitectureGuideLayerDiagrams 1.0
Crystal Reports Templates for Microsoft Visual Studio 2010
JetBrains ReSharper 5.1 C# Edition build 5.1.3000.12 on 2011-01-28T05:05:56
Microsoft Package Manager 1.0
Microsoft Practices Project Linker 1.0
Microsoft Visual Studio 2010 SharePoint Developer Tools 10.0.31118
Microsoft Visual Studio 2010 Ultimate - ENU Service Pack 1 (KB983509) KB983509
Microsoft XNA Game Studio 4.0
PowerCommands for Visual Studio 2010 1.0
PowerGUIExt 1.0
SQL Server Compact 3.5 Toolbox 0.7
Telerik Reporting
Telerik UserSettings VSExtensions 1.0.0.0
Telerik WebUI VSExtensions 2010.03.1317.0
Telerik WinForms VSExtensions 2010.03.1214.0
Update for Microsoft Visual Studio 2010 Ultimate - ENU (KB2465236) KB2465236
ViEmu (Symnum Systems S.L.U.) 2.5.13
VisualSVN 2.0.2
TestDriven.Net 3.0 Personal