We're experiencing an annoying problem issues with ReSharper's color identifiers feature when Visual Studio 2012 is set to the built-in dark theme.
With ReSharper's color identifiers disabled, the code looks fine:

Then, we enable ReSharper's color identifiers:

And now the code is completly unreadable:

The curious thing, on a colleague's machine, the same code, with the same Visual Studio and ReSharper settings... looks right:

We tried reinitializing both Visual Studio and ReSharper settings, disabling add-ons and extensions and other voodoos to no avail.
Here are our setups: