I logged into TF2 Outpost this morning to check on my trades and not a single one was there. I tried searching for some of the ones I remembered and nothing came up.
My OS is Windows 7 and I use Chrome to access Outpost.
I'm not sure if this can be "replicated," as I have not found any similar problem from searching existing discussions, but if you want to try, just log out of Outpost, change your Steam profile picture, and log back into Outpost.