Save your drawing and close the program.

Go to the following folder location C:\Users\Public\Documents\PRO Landscape\Original Symbols V24 and copy the file called _TitleBlocks.SLB

Then go to C:\Users\Public\Documents\PRO Landscape\Symbols and paste that file you copied.

Open the program and try the titleblock button again.

Update: download the latest update to fix the issue for version 24.

Let me know if that fixed the issue