For what it is worth, I have encountered the same problem, but I don't believe that I have reported it as a bug in-game.This issue may have been reported already.
For example, if i have 3 Dreugh Wax and i try to sell 1 in one of my Guilds, the post-to-market process never completes. The Wax disappears from my inventory / craft bag but it's never listed in the Store. If i logout / login back, it appears in my inventory / craft bag.