What should I do if I cannot submit my 90-day report online in Thailand?

Sorry it's a newbie question from an old hand, but trying to do 90-day report online for the Nth time and still no joy. I previously reported in person many times (Chiang Mai). My report date is 9-Feb so I'm in the right timeframe to report online (14-7 days before). Using Google Chrome, fill in all the blanks correctly, click "Submit" and.. well, you know:

" For further information regarding The 90-day Notification Report Service, please contact the Immigration Branch Office in your residence area."

So to put it delicately, WTF? ;-)