First, it is frustrating to have a link to "contact support" and then only to find two options: explore help or write to a forum. Where is the actual support contact? If you don't have it, don't lure and mislead people.
That said, two pieces of feedback:
1. The Windows app needs zoom feature. I have a very large monitor, and I would like to be able to zoom out. As it is, Trello (the beta even more than the old view) looks like an ipad (ie a ton of wasted space).
2. Checklists should be able to be closed up, just like the phone app.