@PlagaNerezza, Moltig is right. As a Gunslinger in a 10/10 16man Nightmare guild, I can safely say learning to utilize your cover bar is a definite must in PVE or PVP. I don't know why people are so upset with the cover bar ... the only abilities that should really be on your cover bar are the abilities that require you to be in cover to use.

Bump! Trying to go down the staircase for Soa with this bug makes that encounter much more interesting.