Windows XP SP2. Updated to SP3 and it seems to still occur, but on the 2nd or third page, not the first.
This same type of behavior seems to happen whenever calibre is in add/search/tag mode (sorry, but not sure what you call the equivalent functionality).
Basically, during these situations, the row height is increased by a couple of pixels and this might be confusing the screen draw. It thinks it's got 11 lines displayed, but only 10 lines and 8 pixels of the 11th line is shown (just able to see the extenders on tall letters - like L and T, etc). But on a PageUp/Down, it jumps as if the 11th line is shown completely.
Hope this has been sufficiently clear.
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