The dev team haven't been able to reproduce these yet. Some questions that might help us track down the issue.
1. Which browsers are you guys using?
2. When scrollbar doesn't show up, does dragging or middle mouse wheel still scroll the screen?
3. The strengthening bug, what does it mean the card count doesn't change? We only had once where a card image didn't load immediately causing the + not to be replaced until later..
4. The data errors, does it happen only when you have specific card on hand such as Jason?