Can't trade - cannot check add box for item

[Telemachus]

Seems I have a cancelled trade with someone in my old house.  That person has not been online since 03NOV2014.  Cannot clear this trade out of the active section.

Secondly, I'm trying to make a trade with another person, and I cannot click on the "add" box.  I can adjust the quantity box, but when I click on the add box the screen just moves up to another item.  Then I get a line a the bottom with the word "filter" and a blue trade box.

[Noname]

I've had the same issue with ticking the boxes, disabling the snow (upper left corner) should fix it 

[Looter]

Oh, I thought it was just me at first, seems like other people got this problem as well.

[Telemachus]

I will try the snow thing.  I did find a work around by tabbing from the quantity window to the add window and hitting the space bar to check the box.