Chrome Javascript console: missing phantom resource

When using Chrome's 开发者_开发知识库JavaScript console I get this error:

X GET file:///C:/Documents%20and%20Settings/ (...etc etc...) /479415

Normally that last part would be a missing GIF or JPG, but nothing is missing, and I cannot find any reference to "479415". The tools in FireFox and IE don't find anything wrong. I've stepped through the code line by line using breakpoints and F10, and this error just appears after index.html has loaded. Any idea what is happening?