This was the unhelpful reply failing to acknowledge at all this has been reported by at least three individuals !!
Sorry to hear that. We do not offer personal support for the free Pix4Dcapture. We are here to answer your questions about Pix4Dmapper and other paid products. However, you can post any of your inquiries on our community page. We are closely monitoring it and you can find the answer to your question through our community. You can also connect with other users on the Community, and ask for advice from your peers.
The behavior you are describing can’t be replicated on our side and has not been reported to us so far. I would suggest you go through all the basic checks and troubleshooting steps as it will solve most of the issues that can be encountered if properly followed.
Regarding the drone speed, there has been some changes. The app computes the maximum speed the drone can have for a given overlap and flight altitude. The Fast speed corresponds to 100% of the maximum speed. Reducing the speed might help to avoid capturing blurry images. Five types of speed can be selected:
Slow : 0.1 m/s
Slow+ : 70% of the maximum speed.
Normal : 80% of the maximum speed.
Normal+ : 90% of the maximum speed.
Fast : Maximum speed.