Not particularly a mouse problem, but I have noticed that while using some edit-book buttons, like find, replace, and such, sometimes nothing seems to happen (no visual feedback when it is expected). Clicking again solves this always thereafter and all works perfectly thereafter. It is like calibre is missing the click event.
I admit, I click fast, but I did not change my habits when I switched from 1.48 to 2.1, and I never encountered it in the past before.
All on Win 7 64 bit, using calibre 2.1
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