Hi Wim,
it might be the java, but I have here at home an other PC, I tried there, all browsers work???
I know it has to do something with the HTTPS
Indeed you are also right, but go to my page, click on mesomap, then you get the possibility to allow adobe flash player
go back to "waarnemingen " and it works…
UNTIL
I typed the adres with HTTPS and suddenly he wouldn’t start anymor: the serial issue errror
when I type in my browser without, the broswers revers to https and it doensn’t work any more 
Is there something in the script I could alter to provoque an always working weather display live panel?
My chrome is V66, Firefox v60, ie Edge latest and IE also latest version 11.48
please advise