It looks like, and I'm just guessing, that when Keith/the programmers added the "search by rarity" SOMETHING broke/removed the form which enabled us to move items. I don't see the necessary "form" tags in the page code, only the "input" tags.
So this isn't a computer/browser/CSS problem... it's a Subeta problem.
I'm surprised more people don't use their vaults as often as possible, if the number of posters on this thread are any indication. I use my Vault to sort EVERYTHING. I dump it in, then sort it out.
I love that the vault breaks a few days after I start trying to clear mine out XD
Hopefully this'll get fixed soon ...

all my flowers are in my vault.. hope it's fixed before the event ends :/
Oh no! I have to take hundred of coins out before the Vesnali contests are over...... Can only do this one by one now which is very inconvenient. Also, when removing an item out of a created group, the page always turns back to the default group which makes it even more tedious because I have to go back to the created group called Currency every time!

Have you tried clicking "[all]" instead of "[x]"? It works for me.
Yes, I tried it yesterday yet IΒ΄ll do it now again just for proof, perhaps it was worked at! ^-^

Because of the changes in the galleries I moved all my vesnalie flowers to my vault too. Wish I hadn't now.
Sure would like to take out multiples rather than one at a time which takes forever since as has been stated when you remove one thing it refreshes to no category instead of the category I've removed the item from.
[flower=jersey]
βJustice will not be served until those who are unaffected are as outraged as those who are.β - Benjamin Franklin
"Woe to those who make unjust laws, to those who issue oppressive decrees, to deprive the poor of their rights and withhold justice from the oppressed of my people, making widows their prey and robbing the orphan." - Isaiah 10:1-2