Here's the link of my post on the bug section on managames forum---> http://www.managames.com/Forum/topic5-18142.php
All details are there.
It would really help if anyone with the same problem can report his situation, so we can better investigate on more details. Even if you don't have this problem, feel free to post if you have any helpful opinion/idea.
It's really annoying, because, on the one hand, my opponent can always complain about some points changed by this problem (and he would be right, even though it happens when I deeply charge my short accell, so when I'm controlling the point). And, on the other, I'm not motivated by winning a point because of this bug, so my level in the following rallies can go down. In addition, if my opponent somehow returns that bugged shot, I'm no more motivated to win the point just thanks to that shot, so I usually let him attack, and eventually lose the point. A part from these points of view, it can however disturb a lot. I hope I'll find a way to solve this.