Upgrading to Ruby 1.8.4 and strange problems!

Hi folks,
There is a strange problem here, I've installed the latest version of
One-Click Ruby installer [1.8.4-16 preview3], everything went fine, and
after that I've installed Rails 1.0.

No problem in setup process, but now, when I try run my rails application,
there are many strange things happening.

In one my application no CSS apply, looks like there is no CSS file, and
worst in another application, I get the following error from the layout
rhtml file.

parse error, unexpected $, expecting kEND

What's changed in this version? Or Do I forget to install a gem or…?

Thanks in advance
- H