This might be happening due to some mistakes that you made during the set up process. In order to fix this, open the program, load a document, go to View menu > Read Out Loud > Read to end document. If the program only reads the header of the document, try to visit the following web page, where the application's options are explained, and try setting up your program again. If the problem persists, I suggest to uninstall the software and install it again.