Thank you, yes weirdly it's just the Crop Tool that's impacted here.
Appreciate this suggestion. I reinstalled it last week and the first photo after I went through this process was fine (crop worked as intended). When I came back to it later to do another one the tool was misbehaving as before.
I have just tried to do the reset as you instructed - thank you for this, I didn't know about this option. I have re-opened Affinity and it has allowed me to crop two photos with the grid...long may that continue.
Thank you for this little Christmas present - very much appreciate the knowledge and guidance on this forum.
JonnyWhitters got a reaction from walt.farrell in Crop Tool Not Allowing Crop