I was consolidating two assemblies, and moved a folder full of images from one assembly to another. I used Refactor|Move rather than a simple copy/paste, because I wanted Resharper to update all the references to the images.
Aaggh - every single one of the images was corrputed!
During the process, Resharper was opening each image in VS. The text screen that was opened was just garbage. I didn't save the opened files.
Anyway - its not really the end of the world. The Move updated the references correctly, and I just ended up recovering the original image files from source control and copy/pasted them into the new assembly.
I also noted that Resharper sometimes gets confused with renaming pack:application,,, addresses - it changes
pack://application:,,,MyOldAssembly;component/Resources/image.png to something like