.htaccess is only a text file, most likely located in your /public_html directory because this problem affected an SMF installation too (which I presume was in a different directory to phpBB)? It may well contain parameters that are causing your problem and it would be easiest for Support to check it (as you have no experience of this).
Alternatively, you could post it's contents here (making sure you hide any personal info) or paste it into a PM to me ...
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Gadge
Too many nice toys — too little time to play with 'em!
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