Further information - on all these books, at the bottom of the store page, it says:
"You can read this item using any of the following Kobo apps and devices:
TABLETS IOS ANDROID"
I tried to add this book to Calibre again from my Kobo Colour:
"The following books are virtual and cannot be added to the library"
What is going on?? Is this new, tougher DRM?
ETA: I found this thread:
https://www.mobileread.com/forums/sh...d.php?t=258837, but it doesn't help as it goes back to the beginning of the loop and recommends downloading the pub from MyBooks - I have no download option available in MyBooks for this particular book. I will contact Kobo and ask if it can be fixed.