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Is anyone else having problems with phpFox 4.6.1b6 search bar?

I have the latest version of phpfox working but users have notified me that the SEARCH bar isn't working on the site.

Once a search term is entered into the search, the page is redirected to a 500 error.

 

I've had support looking into this for almost a month and still no response from them...

Anyone here got any suggestions or knows what the issue is?