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Originally Posted by Geenween
Thank all of you for the helpful replies.
Disconnecting does solve the issue, the problem is that it keeps happening. 
The reader worked correctly until today. I installed Koreader and it worked like a charm.
Today I connected the reader to ADE 3.0 to remove a borrowed ebook and added a new one (my town has a nice virtual library). |
ADE is just puts the book in a particular place on the device. It might update it's manifest file as well, but I don't know. But, from memory, there was a bug with a release of ADE 3 that caused problems. An update was released that solved this. I don't know exactly what it was, but I remembered it was discussed here.
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I used the occasion to sync the reader with Kobo Desktop and it asked me if wanted to sync SD as well.
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I'm pretty sure that wasn't asking but telling you that if it ran out of space on the main memory that it would then use the SD card as well. The device displays a similar message. I think it gets displayed the first time you do a sync when there is a card in the device. And the device and desktop app start putting purchased kepubs on the SD card when the free space on the main memory is less than 100MB.
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When I disconnected the reader, the library was gone. Rebooting fixed the issue, but the device didn't connect with Calibre anymore. Kobo desktop saw the device but couldn't sync it.
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Did either display an error? Or did they just not see the device? And if they didn't see it, did the OS see it?
When connected above, you said you ran the Kobo desktop and ADE. Did you also run calibre? It is not safe to run calibre and the Kobo desktop at the same time. And I recommend against running them in the same connection session. It should be OK, but it's one of those things I think is safer to avoid.
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Apart this, all books worked correctly both with nickel and ADE except the one I transferred over with ADE (the authorization was still active and ADE detected the Kobo correctly). Opening that ebook caused the Kobo to freeze both with nickel and koreader.
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The freeze in nickel might be because of the ADE bug I mentioned. I don't use KOreader so can't comment other than I wouldn't expect it to be able to open the book as a library book would have DRM.
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At this point I'm not sure if the issue is caused by:
- ADE
- Syncing the Kobo with the SD
- Koreader conflicting with any of the above (which would be a problem, since I need the pdf manager) 
Is there any known bug about this?
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Other than the ADE one I mentioned, I can't think of one. Syncing to the SD card should be OK. I haven't seen any bad reports, but I haven't seen many comments about the SD card being used for purchased kepubs.
A thought about space. If you have actually filled the main memory, then ADE putting the library book there might have taken some of the reserved space and caused the rest of the problems. I don't know what would happen in this circumstance, but I suspect it could be "strange things".