All seems OK until I press the "unique" button on the database page (to see which unique stations have spotted me). This worked fine in the past. It has only stopped working in the last few days.
I use Chrome on a Chromebook. It has worked faultlessly for nearly 3 years. I have not tried with other browsers.
UPDATE 0900z: Just tried Firefox. Same error message.
UPDATE 1801z: I think the problem may have been fixed.