[hank]

Nook Glowlight 3; Mac 10.9.5; Calibre; three different USB cables.

Same problems described above with failures to retain sideloaded files and shelves, and it's slowly getting worse. I'm suspecting there's a hardware problem here -- maybe the USB socket wears out, or maybe there's a flaw in the USB chip firmware.

Or maybe they're quietly "improving" the OS unannounced, and screwing up?

At this point, when I plug a USB cable into the Mac then into the Noon -- the Nook does not recognize it at all. No offer to connect. Nothing on the desktop. "About This Mac" USB panel does not show the Nook at all, which it used to do up til last night.

_________
Aha. Tried a fourth USB cable just now. It took about 5 minutes then the Nook appeared on the Mac desktop. I did not get the little box offering to connect, it just connected.

Hmmm. This is the _first_ time that "About This Mac" info window, after a refresh, shows the "Volumes" storage info for the Nook rather than just the info on the USB chip.

Here:

BNRV520:

Product ID: 0x000b
Vendor ID: 0x2080
Version: 99.99
Serial Number: 5074410061473169
Speed: Up to 480 Mb/sec
Manufacturer: BarnesAndNoble
Location ID: 0xfd120000 / 4
Current Available (mA): 500
Current Required (mA): 2
Capacity: 5.91 GB (5,907,574,272 bytes)
Removable Media: Yes
Detachable Drive: Yes
BSD Name: disk1
Partition Map Type: MBR (Master Boot Record)
S.M.A.R.T. status: Not Supported
Volumes:
NOOK:
Capacity: 5.9 GB (5,896,999,936 bytes)
Available: 5.72 GB (5,718,405,120 bytes)
Writable: Yes
File System: MS-DOS FAT32
BSD Name: disk1s1
Mount Point: /Volumes/NOOK
Content: Windows_FAT_32