I have solved the issue on my two PCs. I have uninstalled the Solitaire Collections from my computers. Restarted the computer. Ran the Troubleshooter for the Microsoft Store Apps (Settings > Troubleshoot > Additional troubleshooters > Windows Store Apps ). Restarted the computer. Installed Solitaire Collections from the Microsoft Store. Restarted the computer and than ran Solitaire Collections. This solved the problem for me on both PCs.
I'm not sure whether all restarts are required, but I wasn't taking an chances.
Possibly this may help for other users as well.
Thankyou LeoS22ms - I will give that a go :-)