I downloaded and transferred the OPK in the first thread to my "apps" folder, but whenever I run Genesis Plus Gx I get a black screen. Sound seems to be working normally but I get no video signal whatsoever. What seems to be the problem?
In general if the app is working for everyone except you, you probably just need to update your firmware
You can check your firmware version by going to the Settings menu and running "About". The first line should state:
Build date: Aug 20 2014
If it doesn't then you need to update your firmware. See here
for instructions on how to do this.
If it's still not working, enable Output logs from the GMenu (press START, third option) then run the program. Quit by pushing the power-slider up and pressing SELECT at the same time, then read the output log by running Log Viewer from the Settings menu. Post the Logfile.