Unable to post in XenForo-based forums or Reddit using IE11

[johnwhat]

Since long ago, I've been unable to post in XenForo-based forums and Reddit (not even giving likes or upvotes are possible). With the XenForo-based forum(s) it complains about a JavaScript error and Reddit refreshes the page after a post or vote. I've tried resetting the browser and updated to IE11 (after few attempts) but it would not work.
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Any solutions?

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