From what I can tell it seems like it could be a problem with the graphics card/drivers.
First of all make sure that your graphics card drivers are updated to the latest version unless you have already done so.
You might also check the "output_log.txt" file for clues (it's in the FPVFreerider_Data folder) (or send it to fpvfreerider@gmail.com and I will lhave a look at it).