CI 2.0 bugs?

[eluser]Tominator[/eluser]
Hey everyone!

I'm using CI 2.0 since first versions of it's development. Some days ago it has finally released but it looks like there are some critical errors.

1. Routing
How I said, I'm using CI 2.0 for some months but after updating my localhost crashes and it always load index.php or 404. I found out the solution by replacing core/URI.php with URI.php from older one.

2. Logging
There is written, that logs are now stored inside app directory, but this is definitly not working for me (maybe it's caused by URI.php ) but it always store them inside system dir.

Have I made any mistake somewhere, or is 2.0 really so buggy?