This is related to an ActiveX control which is not registered properly. To prove it, select an entry from one of the "Label Image", an error message "Cannot display image preview" will be prompted, and the explanation to the error is "The ImgDisplay ActiveX control may not be properly registered. Use the Install Workstation functionality of the Configuration Manager to register this control." This means the whole Use properties tab showing blank values is because the error of ActiveX control.
It is quite easy to fix it, just follow the steps below:
1) Locate The ImgDisplay ActiveX control. It is in PT_HOME\bin\client\winx86\ImgDisplay.ocx
2) Unregister it: open a command window, execute: regsvr32 /u PT_HOME\bin\client\winx86\ImgDisplay.ocx
3) Re-register it: on the command window, execute: regsvr32 PT_HOME\bin\client\winx86\ImgDisplay.ocx
4) Reopen the app designer, you should be able to see setting values on Use properties tab now.
NOTE: there are 2 versions of regsvr32.exe in a 64bit Windows OS:
1) c:\windows\system32\regsvr32.exe, this is 64 bit version
2) c:\windows\sysWOW64\regsvr32.exe, this is 32 bit version
Depending on your tools version, you need to use correct version of regsvr32.exe to re-register the ActiveX control.
Hope this helps.