I had the same issue like @JemTheWire today. Unfortunately i had exported the list using the export option only but didnt backup the JFFS partition. I tried to reinstall the script using putty - refreshed my browser but no go .. its back to 64 limit.
During my search in the late hours of the night - i found a utility that allowed me to manually assign ip beyond the current 64 limit. Under LAN > DHCP SERVER it also added the option to export the dhcp list to a CSV format. Today when i woke up - i found that i did not have that feature and the...