Same here, I cannot open a housing tool, or trade houses on either of my accounts. I put in a help request but no GM has answered after 2 hours waiting.
Double clicking the tool does litterally nothing, no reaction or message what-so-ever.
Trading is the same. You get as far as the recipients targeting cursor, then when you click on the character to receive the house the cursor reverts to normal again and the trade window does not initiate. There is no message on either character. However attempting to use the house sign shortly after attempting the first trade gives you a message that the house is currently being traded. The bugged trade attempt seems to time out after a few minutes and you can then use the house sign again.