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I'm afraid that didn't work out too-well on first attempt at least :(
Replacing NewBB 4.0 with 4.3 prompted me to update the module which I did. I also updated the system module, cleared the smarty caches and deleted browser cookies for good measure. Navigating to the forum I got the main menu, and saw a much-improved layout. Very pleased.
But once I selected a topic to view I got a system 500 error. I was still able to get to the module preferences from control panel, made sure they were ok, did a sync but to no avail. It may well be something trivial but not having scheduled any downtime I went back to 4.0 which still has some sort of permissions problem. At least users can add and reply to topics, they just can't edit them.
Ideally of course I'd like to have the latest and greatest version of NewBB and am willing to try and debug it further, but where do I start with a 500 error? As I say the forum main menu appears, selecting a topic (viewtopic.php) is where the error occurs. Where might I find an error log to assist me? Of course I'm on a shared hosting plan and don't have root.