Quit sorter and reopened - folders gone

I quit the sorter and reopened it to find that the group folder images were gone and I may no longer open the group directly from the sorter (it just opens the database), although items dropped in the square DO still go to the correct group. The only fix I’ve found is to remove the groups and drag them in again. Is there a fix? If not, will there be a fix? Thanks.

I will have a look to see what could cause this behaviour in the Sorter. It is possible that the group state information was corrupted.