I am aware that the forums are currently not working. I am in the process of working on this and will report back when all is up and running again.
I've checked that the files indicated are present and are configured correctly (ie. no upper/lower case differences) but cannot find a problem. No files have been changed recently so I don't understand what could've gone wrong overnight. I have therefore contacted my host and am now awaiting response. If anybody has any ideas as to how I can fix this myself, I would be very pleased to hear from you.
In the meantime, if you need any help on any puzzle, please email me directly at firstname.lastname@example.org or catch me on Facebook and I'll be happy to help.
And finally, the problem with the forum is fixed. No idea who fixed it and how, but I'm just so glad it is. If nothing else, it's taught me that I need to upgrade the forum so that will be my next task!