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I've hesitated to join this discussion because I know zip about computers. But I had exactly the same symptoms on my computer quite a while ago and it lasted about a year and then abruptly cleared up.
However, I remember trying to think about what had changed in my computer since the last time I'd opened Calibre and the only thing I could think of was that I'd had a Windows Update. I looked at the log of updates and there were a couple of updates to the Microsoft.NET Framework and wondered if there was some conflict.
As I said, it cleared up on its own though it took a long time. But I wonder if Harry T can remember if his problem occurred after the recent Update which happened on 5/12/15, and which also involved the NET Framework, at least on my machine.
Jim
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