I had the issue where when I opened up the Label tab of a push button on a page, the Label Type, Label Size are blank, Label Text shows up as Static Text. When I changed the settings, and clicked OK to save it. The change did not register.
The fix turned out to be to go to the Configuration Manager, then go to Client Setup tab, then check the “Install Workstation” checkbox, click OK or Apply.
Now restart Application Designer, the issue should be fixed now.