Open the tablespace browser and select a tablespace containing objects.
Clicking the refresh button results in the object contents view being empty.
1.) Open tablespace browser and choose a tablespace e.g Users, the associated objects are displayed.
2.) Click the refresh button and the display is reset as the tablespace selection is reset. This is by-design.
3.) Choose the same tablespace name from the drop-down, "Users" and no object data is displayed.