Post EFX issue

Hi. I am wanting to select a different delay in the post EFX section. However when I press the Delay button I can only choose from the stomp pedals when I turn the Browse knob. The Reverb button works as normal and I can select between the available delays. I am sure that I have done something wrong somewhere, but cannot think what.

Solved! I was using a beta OS and reverted to the last official release. The Strange thing is that until yesterday the Delay Post EFX had been working??????