Unfortunately, if it is not an issue with modified code it sounds like your system isn't allowing the use of eval() which means there isn't much we can do; eval is used all over smarty which is our template engine so there isn't a real *fix* other than to figure out why your system isn't allowing use of eval.

We have tested UBB.threads with PHP7.0-7.4.6 without any issues with eval.
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