While testing the Spark (seems all I do is test rather than fly) the video is now very dark and underexposed. I need to push exposure up to +1.3 to get a decent picture. I have not needed to do this in the past. Why is this happening?

Try ptouch the screen ( yellow circle)  while flying to auto adjust exposure.Spark is very bad in auto exposure handling....maybe firmware update fix this

Strange. Do you have an example online?

What time of day are you flying?  What are the lighting conditions (full sun, full cloudy, partially cloudy, etc)?  What is the subject of your videos?  Some examples would really be useful to be able to comment.  An example without any exposure compensation as well as one with the +1.3 you mention.

Sorry for all the questions, just trying to get the useful info for everybody to be able to provide some opinions.

Sir, please be more specific of your issue for better assistance.