yesterday on 2 different games, just as the match started, I opened as always the shop to buy the items.
Then I right click to purchase and there the problems start. The "tango" icon stays "attached" to my mouse and I cannot click anything anymore.
On one game another icon (a mana potion) stays floating on the screen as well and i cannot get rid of neither of the two. Cannot buy, cannot drag to quickbuy bar, cannot do anything except pause and restart the game. This solved the problem.
I use a razer Naga and Nostromo, if it helps. Didn't have any problems up to now, so I guess it's something on the last patch.
Feel free to ask if you need other details, unfortunatly i have no screenshots.