Theorical:
I've just upgraded to 4.3 RC2, just having this problem starting w/ 4.3 RC1, and it involves issuing a queue command.
Pratical:
Login to sites, highlight some stuff you wanna FXP and CTRL+Q will make each items displayed twice in the transfer queue.
Thanks:
BigStar <3
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FIX:
Sorry, i lied: the doubling actually happens when going for CTRL+T. CTRL+Q just queues and CTRL+T requeues what's still selected... Or is that a feature?