Rails loads wrong files

I run in to errors which I dont understand:
I never get the newest version of code (xxx.html.erb) displayed,
instead
my editors backupfile (xxx.html.erb.bak) are loaded/run.

I run Rails v2.3.2 (I am new. How to install 2.0.2? "gem install
rails"
put 2.3.2. on my windows xp machine)

Situation:

1) In my app there are some files (xxx.html.erb) as it should be.
These files above I have been written and edited with my editor (i.e.
UltraEdit)
/rails_apps/coconut/app/views/flights/show.html.erb
/rails_apps/coconut/app/views/flights/_new_seat.html.erb
/rails_apps/coconut/app/views/flights/_seat_list.html.erb

2) The Editor saves backup files from the last version of the file
with
extension .bak, like (xxx.html.erb.bak):
/rails_apps/coconut/app/views/flights/show.html.erb.bak
/rails_apps/coconut/app/views/flights/_new_seat.html.erb.bak
/rails_apps/coconut/app/views/flights/_seat_list.html.erb.bak

3) When I make a mistake in coding, the error page displayed concerns
the backup files (xxx.html.erb.bak), not the xxx.html.erb files!!!
So I never get the newest version of code (xxx.html.erb) loaded nor
displayed.

4) When there is a backup file (i.e.
app/views/flights/show.html.erb.bak), Rails error page shows content
of
the backup file (xxx.thml.erb.bak), not of the current file
(xxx.html.erb):

####### START #################