When I insert a Netkey3.0 card (I only managed the following with this type of card) remove it, directly insert it again and hit F5, both Kleo and scdaemon will say that no card is inserted. Only after waiting for about 20 seconds after reinserting the card Reload will work. (Loading the card takes about 20 seconds, too, btw.) This is 100% reproducible.

Here Scdaemon does *not* hang.