Only the two css files in styles nothing else.
But also if you did you probably need to update your custom styles to make entries in the new classes.
Need to read in install/UPGRADE_INSTRUCTIONS.txt
That is why I asked if you turned on a stock style for testing.
Kinda a old version.
need to research it a bit for other tidbits.

Blue Man Group
There is no such thing as stupid questions. Just stupid answers