Hm you are providing a gif file but Java (ImageIO) tries to read an ico 
file? Thats the first thing I would think about. Maybe your file has a 
wrong extension or is somehow corrupted?
What kind of libraries does your application use? Maybe one of your 
libraries alters the behavior of Java's ImageIO? 
Does the stack trace contain any caused by exceptions?

You could also set a breakpoint in ImageResourceGenerator.addImage() and 
start debugging GWT's DevMode to see whats going on.

When you have @Source("rtick.gif") then the image must be in the same 
package as the client bundle.

-- J.

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