Missing coins from trading post sales
Something like this happened to me last night. I sold about 4g worth of runes and when I went to collect I only received 1.6g.
A while later (30-40 mins) I went back and was able to collect the rest of my gold. I put in a help ticket asking why this happened and was told that some of the items were not sold right away from the auction house.
Have you checked back to see if your $$ was available for pick up recently?
I just figured it out. The trading post has a limit of 100 transactions on your pick-up list. I had over 600 transactions so had to process the first 500 transactions before they sale transaction pick-up was available. Luckily someone donated a few coins so I could buy salvage kits. Problem solved.