Column width preferences do not persist between login sessions when you use Search Table Views for entities with high field counts. The column widths revert to the default after you log out and log back in.  

For example, this issue occurs when you complete steps similar to the following:

1. Add a large number of fields to the Table View for an entity. (For example, add 99 fields.)
2. Perform a search and filter to that entity so it displays all columns.
3. Adjust the width of some of the columns.
4. Refresh your browser.
5. Repeat step two.
6. The column width reverts to the default. 

There is no workaround for this issue.