I recently purchased an FL-600R Flash. I have been learning to use it with my OMD-EM5 and all was progressing well. I went to continue my education the other day and I just can't get it to flash. It will turn on and communicate with the camera (zoom, modes etc etc). The Test Charge Indicator glows orange but it also won't flash when pushed. I have changed batteries, checked to ensure that it is seated properly on the hot shoe and tried it in RC Mode. I have tried TTL, Manual, Auto etc etc etc modes. Could it be a setting that I have inadvertently changed in the camera? Does anyone have any clues?