ipaq wrangling

Am sitting here in a hotel room in Jersey, sorting out ipaqs for tomorrow's demo at Branchage International Film Festival. I thought I would double check them all again becuase I had to take the batteries out to travel here - I hate the idea of the little buggers switching themselves on when they rub against each other in my hand luggage. I had the usual double check from security staff at the airport when twenty handheld devices popped up on the x-ray machine. Then I sat in the airport cafe removing all the batteries just to be on the safe side. It was a bit of a late night last night getting ready to come here - so much on top of the usual chaos! Carpet fitters laying carpet and taking off bathroom doors - which is a problem when you have paying guests, elderly mother in law passing out when shopping and being in hospital for heart tests, children being generally uncooperative with stessed parents etc etc But enough whinging.
I got here, had cream tea (well, coffee and walnut cake, and watched my daughter and her partner eat creamcakes, then headded to the hotel to get sorted. I put the batteries in the ipaqs, checked the settings (you have to make sure the devices don't go into powersave mode and dim their own screens or switch off). It was all going swimmingly 'til FOUR out of the 20 started complaining that they couldn't locate the file they wanted. Presumable the last user had set them to automatically load the mscape software and go to one particular experience, which I had deleted last night because I didn't need a music tour of Leeds city centre for this demo.
I tried clicking ok - no effect - then pushing buttons (hard buttons presumably disable) whinged out loud a little, and then texted Tom Melamed as he is usually quite helpful even out of hours when he senses desperation. Then I thought of factory reset trick - where you hold down the two outer buttons and stick the pen in the reset hole. Hurrah! It worked, but I had to then reload the mscape player as the reset to factory settings wipes out added bits and pieces (technical term). I'm glad I thought to check that, as I vaguely remembered being caught out before with that one. I was in full flow when text came from Tom, telling me to check the ipaq file store for a folder probably called 2577 and to delete or rename it and see if that works. I am writing that down for next time.