Cannot obtain value of local or argument as it is not available at this instruction pointer, possibly because it has been optimized away

Question

Visual Studio 2010 kills (there is no other word) data in one of the arguments of the function in the unsafe block. What could cause this error? The following message shows

Answer 1

As an additional answer for those experiencing this issue when debugging an Azure websites' web app:

When deploying from GitHub, for example, the code is compiled in Azure server optimized by default.

I tell the server to compile in a debuggable way by setting SCM_BUILD_ARGS to /p:Configuration=Debug

but there are more options. See this: http://azure.microsoft.com/blog/2014/05/08/introduction-to-remote-debugging-on-azure-web-sites-part-3-multi-instance-environment-and-git/