I hope I don't come across this 750 Zen bug, at the moment it only wants EC from me, but when I click "Buy" the window closes and it says "Outfit uses invalid parts", my changes are then lost.
I am also having this problem when I try to customize either the Tier 4 Bird of Prey or the Mirror Quin Raptor. Please sort this as customization is a big part of what makes this game so enjoyable :( EDIT: I am now also getting this bug on my Federation character when I try to customize my Vesta class.