I am having a problem with the radcombox which started when I moved to the last update in January. All of sudden in code that has not changed for 5+ years when on radcomboboxes that are required when retrieving the value either by SelectedItem.Value or SelectedValue they return a null value for my remote users. My remote users are using a VPN connection. After the error occurs if they either restart by going back into the page(s) following the links or they restart their browser then it works. However, a few minutes later it may not. I have done remote sessions with users to see if there is anything client side script wise and I cannot see anything. It is very frustrating because it is occurring in areas that have not had any changes for a long time. I am at a loss where to begin to track this down. My only recourse has to put extra code in critical areas to prevent at the least the losing of long text. What I see in the errors I capture is just nulls for the combos.
Attached is a page rendering that when the save button was clicked the Region dropdown came back to the server side code with a selected value as null despite the fact they had actually selected it.
Let me know if I need to open a ticket so I can do remote sessions or such.