MyBB Community Forums

^ yes, give them MyBB error you got,
& how the error occurred (what you were trying to post) ..

do you also get the error when you try to post a reply to thread ?
have you checked by switching to MyBB's Stock theme ?

When I try to reply it just infinitely loads, and yes I have tried switching.

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Issue was some added code in post.php that has now been removed. Thanks for trying to help even though it wasn't an issue on your end!