Items show up as blank spaces when trading with friend over steam

Playing Team Fortress 2 Premium, I am trying to send my friend a Pip-boy, for the engineer. For some reason, hey can not receive items for Team Fortress 2.
He can receive Steam Trading Cards, and games, but when I drag a Team Fortress 2 item into the trade, all it appears as is a blank space. My friend also sees nothing. How do we fix this?
Best Answer
This is a fairly common side effect when trading servers are experiencing issues (which is quite frequently).
If you're dragging stuff over to your trade window or double clicking on items and it's not responding by putting that item in the trade window, give it a few minutes/hours/other arbitrary time period and try again.
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Why is my Steam trading Not working?
It means that if the steam guard wasn't active for the profile from the previous 15 days, they won't be able to trade. Recent Activities: If the user has recently changed their password, trading will be disabled for at least 5 days and the user will have to wait for this period before trading is enabled again.How do I trade with friends on Steam?
To send an offer from a friend's profile:How long do you have to be friends to trade on Steam?
What is a trade hold? A trade hold is a period of time after a trade is accepted by both parties where the items traded are held by Steam before they are delivered. Trade holds last up to 15 days. If you're trading items with a friend, and you've been friends for more than 1 year, the hold is 1 day.Confirmation of Trades - Steam - How to turn off
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