I’m getting a very similar issue. I can load up the Gem Store no problems, but when I choose “Buy Gems” the menu for gem purchasing pops up but doesn’t load any options to choose in order to actually purchase gems. The “Buy Gems” menu loading then also pushes down anything previously loaded in the gem store landing screen so that only the categories are clickable/visible.
Very frustrating as I’m obviously unable to take advantage of any of the prices in the sale.
*edit: I was able to access the ability to purchase gems by clicking inside the “its easy to purchase more gems..” section and pulling down on the mouse – thus ‘scrolling through’ the contents. I had to do that in each subsequent step. So the style sheet on the Gem Store is very much not rendering/loading correctly.