Lee / Harry,
A bit of a coincidence, but one of my mates from the airfield has been on the phone over the last hour or so - He had been trying to do a fresh 'Full Install' of 20180520 onto a PI2B+ for another mate - as advised by me yesterday after reported dropouts following an earlier USB (.pgp) update to the same version. He initially said that after a 'Full Overwrite' Format - using SDFv5, loading the Full Version of 20180520 onto the (8Gb) card and leaving the PAW unit powered up for over 2 hours, he was still seeing no WiFi Hotspot and the PAW was showing only the single solid red (Power) LED, though he had seen the Disc and Bridge LEDs flashing when the disc first started 'loading'.
I suggested he remove all dongles except the WiFi dongle, attach a monitor, then try a restart and let me know what happened. If this didn't work, he was planning to try a fresh install on another card, but only had a 2Gb card available.
He has just phoned back to say he tried the restart with the original 8Gb card, with the monitor, but it had hung very early into the process (I did explain to him what to expect) - so he removed the card, ran a 'Quick Format' on it using the Standard Windows 10 Formatter with the Default FAT32 allocation size, then re-copied the software onto the card, put it into the PilotAware and Bingo - It booted first time and seems to be running fine (so far at least).
Not sure if this helps, but it's certainly an interesting development.
Regards
Peter