Some users are reporting 2 issues with column chooser on the work tasks screen.
1. They add columns using column chooser to the Work Tasks screen and save the changes by logging of of IFS correctly with the Exit button to ensure they are saved correctly. They may seem fine for a period of time, and then one day when they login (days or even weeks later), they have disappeared and have to be manually added back again. 

The other issue with this is when they go to add the columns back again, some of them no longer show up in the Hidden columns list on the left. In the latest example, someone wanted to add the  Task Card ID/Subtask ID column back, but is not in the list. If they start typing the name of it into the Filter box at the top of the Hidden Cols list, it becomes visible.

Most of the complaints like this are for the Work Tasks screen, so what is going on here? We have a couple of users where this has happened multiple times.

The only other information that maybe relevant is most of our users are on Citrix thin clients, but if this could be the cause, we would expect alot more complaints about this issue from different users, for different screens and not just this one.