I suddenly have a strange problem with my dropdowns: they used to work fine for months, but suddenly, in edit mode, the form no longer shows the value and puts a red box around the dropdown. You have to select (the same or other) value from the dropdown. It is then perfectly saved, but when you retrieve the row again in the form, the same happens: value not displayed and red box around the dropdown (it´s a mandatory dropdown).
I use the dropdown with a connected dataset and put the text value of the value chosen in the main row. So I do not use a ref field (I built this before ref fields even existed).
Has anything changed? I simply cannot find the cause.