[CLIENT] Can't buy RP since last patch

Since last patch, when I try to buy RP I get a black screen. The links still work : the cursor becomes a hand, and i can click on point quantities.

The thing is, after this i still get a black screen... I see the cursor becomes a typing cursor (the vertical bar) on a few spot, but i have no clue what to type.

There is an exception! When the payment option is Paypal, I get the paypal screen! And there the whole client closes after a few seconds.

This is a sad, as I wanted to get a few snowdown sales.