I did get it work with more than 124 channels after resetting the provider. I had tried resetting this before a number of times but it apparently didn't take.
The current setting of Shaw Cablesystems - Digital (V1X7K6) works so I will make a note of this so I know what to set it to if it reverts to the under 124 channels listed.
I am still unsatisfied with the 3 hour fixed time slice setting, no ability to re-arrange the order of channel listings or displaying more complete listing for just one selected channel.
I will be taking another look at Shaw app for the iPad in light of this even though I prefer using the UHD monitor attached to my desktop PC.
Gateway and 3 Portals, Samsung FP-T6374 TV, Panasonic DMR-E80, Denon AVR-3808, Sony CX777ES