I am using Chrome 5.0.375.70, reportedly completely up-to-date. I also pressed F5 to refresh the site and enable all changes.
When modifying a completed deck, everything seems to function just fine. However, I had an unfinished deck and am having the following experience with it:
UPDATE: While I first thought that it was the fact that the deck was unfinished, it turned out that the problem was that I had an apostrophe in the deck's name. I don't know why this is the case, but anyone else experiencing difficulty should try removing unusual characters from deck titles and seeing if that fixes things.
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The auto-scrolling in the Deck section works fine. I hover to the edges and it scrolls as described in the update text.
Clicking on the buttons and menus above all functions correctly as it always did. I can set and change token counters, for example.
However, clicking the cards does nothing. I have empty spaces in my deck, but clicking on both cards in my deck and available cards above does nothing at all. I can highlight the text on the cards by clicking and dragging, but nothing else.
After some experimenting, I used the Reset button. It cleared all the cards from my deck, but still did not allow me to select new ones.
Ultimately, I was able to fix the problem by using the Import feature to create a deck I had previously exported. Once it had a completed deck in place, I was able to return and take cards like in any of my other decks.
After further experimentation, I realized that the problem was not related to it being an unfinished deck. The problem was that the deck's name had an apostrophe in it! Importing the other deck changed the name to something else, and that's why it then worked. When I fixed the deck and then set its name back, it ceased functioning again.