I have noticed some very minor and I mean very minor leaking - about the size of a pin head at most. Not enough for me to worry about...
I get the same thing at times, SR. I have to be very careful how I screw the clearo onto the battery. I think that's the issue with the pinhead sized leaking, but I'm not sure yet. Still testing. I think it will take LOTS more vaping before I can be sure. Any excuse to vape more!