The day after my last post, I went back to the VHA program that wouldn't open and to my amazement it had opened on its own and was operational. Today I decided to close the application and reopen it to be sure that it still worked. While it took several minutes, it did actually open again. So, I conclude that the application does work in Yosemite but may take minutes or hours to actually open. Verizon should determine why the program takes so long to open in Yosemite.