Upgrade to version 2.5.4. It has a fix for IE users. I had the same problem and what I did to fix it temporarily was make the default skin v3arcade. For some reason, IE users were able to play tournaments with it that way.
But download the new version 2.5.4, it has a few fixes in there. It also has a few bugs, so you'll have to read back about some of the tweaks you gotta make to the script(s).
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