[charlessmall18]

Thanks everone for your suggestions but I stumbled across the solution to this problem by RTFMing the Calibre LInux download page. You see, I recently became beyond fed up with Windows and switched to a dual-boot Windows/Linux system (I use mostly Open Source programs anyway but for my job i have to be able to run AutoCAD and some Adobe programs). I had been trying out the Ubuntu distro in the VMware Player for so0me time and liked it just fine. So i went with it for my Linux installation. Prior to installing Linux, i un-installed all my Open Source software from Windows and re-installed them all -- mostly from the Ubuntu software Center -- in Linux. Right! The Ubuntu Software Center gave me Calibre v 8.38 and the Calibre site is up to v 8.49. Guess what? The center nav button on my $80 Kindle now works the way it used to now that I un-installed v 8.38 and got v 8.49 from the Calibre site. DUH! As you might infer, having been bitten hard many, many times, I am a hard-bitten Windows vicitim -- er...Windows user -- and am old enough to have used DOS and UNIX back in the day. So I was unfazed about un-installing the painlessly installed Ubutu obsolete/boogered version of Calibre and pasting in the really scary looking command line supplied on the Calibre download page. Because Amazon has something like 80% of the e-book reader market and not everyone switching to Linux from Windows would be ok with the command line, is there any way to get the following into the Calibre communcal memory: (a) ask people with Calibre/Kindle problems if they are running Linux and (b) if their version of Calibre is up to date and (c) if it's not up to date, giving them comprehensive and sympathetic hand-holding so that they can begin troubleshooting any Calibre/Linux/Kindle problem by first getting the most up to date and correct version of Calibre? Windows and Mac users would probably never have this fundamental problem, I would hazard, because updating is not scary with those OSs.