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On the server lies a html file with javascript code included. This javascript code includes a method called something like "CheckObject".

This file works for all users, except one specific (but important). He gets a javascript error and in his browser sourcode appears something unbelievable: The methodname "CheckObject" is replaced with "Check!==ect", means the "Obj" of the method name is replaced with !==.

Why could that be?

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More information would be helpful, e.g. what browsers and plugins the successful/unsuccessful users are using. One possibility: a GreaseMonkey script in the important user's Firefox is changing the JS (as they do) in a way not intended. – CarlF Dec 29 '10 at 20:16
@CarlF: I agree, this is most likely an issue on the client-side, with some plugin/addin/script messing with the file. – Bobby Dec 29 '10 at 20:18

Check your encoding. Use the W3C validator service for this.

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