2. I was playing last night and there were some very weird display issues with displaying cost reduction. My opponent played a Highway and the cards in the supply did not change cost a lot of the time. Then sometimes he would buy a Highway and THAT card in the supply showed as having the appropriate reduction but none of the other supply cards would show the cost reduction.
I encountered a similar problem yesterday. On my opponent's turns the cost of Destrier (as seen by me) was not being updated when he gained cards during his turn. I assume that it was being properly updated for him (it certainly was for me during my turns), given that he successfully bought reduced-cost Destriers on several occasions.
I use Firefox on Ubuntu. Like Adam I'd got the impression recently that the game was laggy, but I'd been inclined to attribute that to the age (14 years) of my Dell PC. I probably still am inclind to attribute it to that. My guess is that the client is now more compute-intensive than it was in the past, something that would certainly be much more noticeable on old hardware.