It happened a couple of times before but I thought I was just mistaken. It happened again today and I am sure I am not nuts.
Today I sold 12 items on GTN. By the time I logged in back into the game I received payment for 6 of the items. There were still 6 mails sitting in my box telling me that within an hour I should get money for the rest. I decided to play another character so I logged the other character. Played for a couple of hours, sent the crew to do their thing and logged back into the first toon. Checked my mail and there is nothing there. No payment. Not even the mail that I left in the box with information that payment is coming. The items are also gone from my sale list.