Can you please try replicate this and pay attention if the Loop-IN lights up when CUE button gets hit multiple times?
Before I was able to hit the CUE button unlimited times without this happening, but now if I hit it more than once - intermittently - this bug shows its ugly head! I'm on RZX as well.
I've been having this bug since 4.3.0 Beta1 and it seems also be the case in the:
4.3.0 rev.9650-10861-10857 x64
I suspect its Quantize related but I can't be sure.
Have you tried the new firmware 1.08 with a fix for smoother pitch control? On 6% its much better but not as smooth as it could be.