[DMcCunney]

I have current 64 bit Calibre running under Win10 Pro. I use an Android tablet as my eBook viewer, and use Calibre to transfer books to the tablet. Connection is via a USB cable using mtp.

When Calibre is run and the tablet is plugged into the desktop, Calibre sees the tablet and enumerates the files already there. This takes a while, since there are thousands of books stored on an external 32GB microSD card. Eventually, Calibre finishes discovery, and books already on tablet are checked in the On Device column. Thus far, all is well.

The quirk occurs when I select new books to add to the tablet. When I try, Calibre sometimes says there isn't enough memory to hold them, but the card has GB of free space. Calibre is apparently trying to send the eBook files to Main memory. The problem is "Send to Card A" is already selected as the default destination for books Calibre will transfer. If I click on the Send to Device sub-menu and click the Send to Card A selection (which is already highlighted as the default), then try Sending to Device again, it works as expected.

What I don't understand is why it's failing the first time. Calibre has already been told Card A is the destination to send to, so why it tries to send to Main Memory at all is a good question. It's more confusing because it doesn't happen every time. I'm posting because it just happened today, and had happened yesterday as well, but had worked fine several days previous.

This is not a show stopper. It's easy enough to remind Calibre that Card A is the destination if I get the insufficient memory popup. I'd just love to know what's going on.

Suggestions?
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Dennis