(edited by Rabe.2456)
Can't use skills after Conjure Icebow
There is already a longer thread about it. This problem is older than the last patch and seems to be caused by picking up a bundle the moment it disappears (because of its timer or because another player picked it up). The only workarounds so far seem to zone out/log out or get downed. Some claim that /dance fixed it for them, but it did not help for me.