Just for the record, there has been small change to GTS offering/making a new trade.
First, now the new boxes system is supported, though I should have done it yesterday
Second, I changed something that some of you suggested in the past. Earlier upon loading of "New trade"/"Offer" screen, all of your Virtuadopts were loading as well, even if they remained in box you didn't plan to open.
Now, when you open one of those pages, none of the boxes load yet. If you expand one of the boxes, they will start to load - this way, you may only open a box with Virtuadopts "for trade", and they will be the only ones loaded on page. It should be a relief for users with hundreds of Virtuadopts.