Leaving calibre running was probably the cause then.
I keep forgetting that I have to quit the program by using the right click on the toolbar icon to quit the program.
I always just click on the x in the upper right corner of the window to close the window thinking that the program is being automatically being shutdown. This is the usually the case for about 99% of the programs that I use, so it's just a normal action that I don't really think about.
Anyway, thanks for the info Kovid.
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