I got my Spark 5 days ago and it won't fly foreward because it was saying there was something in front of it.  There was nothing in front of it and it was about 24m high.  I can only fly it forewards when obstacle avoidance is disabled.  I tried to use active track today and it didn't work because I needed to have my obstcle avoidance on, but when i turned it on, it wouldnt fly because it was saying it had detected an obstacle, but there was nothing there.  I don't know why this is happening.  Is this a software issue or could the sensor be damaged?  does anyone know how to fix this?

This will occur if you're flying directly into the sun when OA is active.

There was just another case reported here and the cause have been wrongly attached prop guards. Those with white mark have to go on the props with white mark. You might check that.

Stupid question, I ask only because I did it myself, did you remove the plastic protective films on the sensors?

Hi, sir. Please provide the info mentioned above and keep us updated, thanks.