I can buy on the trading post and search just fine. But I cannot sell on any of my 6 characters. It started this with the last patch. I dual boot into my main OS Windows 7 64 bit and sometimes into Windows 8 Enterprise 64 bit. So I have tried all of the following on both OS with no success.
A) deleting the local.dat file
B) creating a new desktop shortcut with the -repair extension
C) starting the game, clicking on a character, go to trading post and stand in front of a npc , open my inventory and right click sell at at trading post.
D) multiple restarts of system and restarts of game client
E) changing characters
F) I even tried to redownload the game to reinstall (that of course did not work but I did try.
I have searched the forums and the web and other game sites with no luck. I am left with a unusable game as being able to sell items is my only real means of getting sufficient money to purchase gear upgrades. What am I suppose to do now?

To all of you, thanks for all your contributions. Since the problem has been solved, we proceed to close the thread.