If you want a temp fix you can use this:
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I do not recommend this as it only fixes the error messages you get with fiddler.
If you really want to fix it you should recompile the custom client, here instructions: (advanced)
Code:
This is based on the original client, but I replaced all images, videos and resources it uses, plus I replaced and revised the user interface.
Since this required modifying over 600 .swf files and over 7000 images inside them, I wrote a program (using the programming language Ruby) to to the job.
The program I've made is also released with this, you can find it attached inside the archive, as open-source software. To run it, you will need to have Ruby 1.8.*, ImageMagick, RMagick and swfmill installed on your system.
Then you can simply run it by writing
Code:
ruby generate_custom_client.rb
in a command line.
It runs on Windows, Linux, and other platforms, but I recommend Linux as it's easiest to set it up with.