Thank you, Taming. There was some history there that I was unaware of, and it does start to make some sort of sense. It is what makes our unofficial attempt to work out the differences in the readers so fascinating!
Whist 2.1.1 does address key functionality issues (slower page turns than 2.0.1/.2, which I didn't have as badly as others) , it is clear that it is struggling in other areas (time to open Annotations box, for instance). There are definitely pathways that it doesn't manage well, though this seems to be a common complaint, which I consider to mean that the processor or some other hardware is close to the limit of its capabilities, so that there are always compromises built in (especially between pure programming and marketing needs) to maintain some sort of acceptable performance.
I take the point about future releases depending on what is already installed, and I shall be ready to downgrade to a stable version and reinstall whatever the next version is if I have any problems at all. I suspect this is the case across the board - after all, the average user hasn't manually upgraded to 2.1.1!
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