Radio Jioc

I upgraded from Kubuntu 18.04 to 20.04 a little over a week ago. Since then Dropbox isn't syncing anymore. The icon in the task bar keeps switching between the network folder icon and the box icon (Dropbox logo), as if it were really busy up- or downloading something. But nothing actually goes up or down. (E.g. I verified that photos have been uploaded from my phone by checking on the web interface, but they don't come down to my PC. Likewise I created a new file on the PC and it does not show up on the web interface.) When clicking on the menu > "Recently changed files" there is nothing there in the submenu.