The work around listed below by JDRoss of clicking on the gems and avoiding the featured page did work for me.
I am also having this problem where as soon as I click on the store menu item my screen goes black and I can still move my cursor around but can't access options or do anything anymore. Before the latest patch it would get stuck in this state, but now it exits the game after a few seconds and another program pops up quickly to record a log or something. I was also getting similar behavior to try to buy the mastery pass before and ended up working around it by getting it on my wife's computer.
The work around listed below by JDRoss of clicking on the gems and avoiding the featured page did work for me.
I am also having this problem where as soon as I click on the store menu item my screen goes black and I can still move my cursor around but can't access options or do anything anymore. Before the latest patch it would get stuck in this state, but now it exits the game after a few seconds and another program pops up quickly to record a log or something. I was also getting similar behavior to try to buy the mastery pass before and ended up working around it by getting it on my wife's computer.