No, they fail if I try to install them from the market. I actually get an "Installation error" "Unknown reason -18" when they fail.
I'm also having some weird battery life reporting issues but they've been happening for a while on MIUI. My phone just went from 40% to 5% battery remaining in less than a minute.
Have you tried force closing market and clearing data and cache via manage applications/all? This has helped me out in the past.