Got it, great, that video made it very clear. Thank you Ford!
Your best bet is to re-burn the image. We have seen this with some of the earlier SD cards we've put out and we don't know why thi s happens, but the solution is to just re-burn the image. Something got corrupted, not sure what. The SD card itself is just just fine, the software on it for some reason is corrupted.
Here are some step by step instructions, and videos on how to do it: http://www.dexterindustries.com/howto/install-raspbian-for-robots-image-on-an-sd-card/
With a Mac, it's relatively painless, using Etcher (graphical software). If you have any questions, please shoot them out.
We can also try to send you a replacement SD Card. Can you contact us through the website at dexterindustries.com/contact if you'd like us to replace the SD Card?