Some gem executables broken after rvm update

gistfile1.bash

# I ran "rvm update 1.8.7-p334 1.8.7-p352" and started encountering
# some errors with certain executables.  Below I demonstrate how
# some gem executables work and some don't


$ rake
bash: /home/eric/.rvm/gems/ruby-1.8.7-p352@ykiw/bin/rake: /home/eric/.rvm/rubies/ruby-1.8.7-p334/bin/ruby: bad interpreter: No such file or directory


# showing my rvm path for gems, replace with yours in the
# "cat" lines below

$ which rake
/home/eric/.rvm/gems/ruby-1.8.7-p352@ykiw/bin/rake


# Valid Executables
#--------------------------------------------------------------------
# ri: valid output

$ ri
Enter the method name you want to look up.
...


# ri: (first line of executable)

$ cat ~/.rvm/gems/ruby-1.8.7-p352@ykiw/bin/ri
#!/home/eric/.rvm/rubies/ruby-1.8.7-p352/bin/ruby
...

# cucumber: (File partially loads.  Ruby found, Rails not found)
$ cucumber
Using the default profile...
no such file to load -- rails (LoadError)

# cucumber: (first line of executable, inconsistent with above)

$ cat ~/.rvm/gems/ruby-1.8.7-p352@ykiw/bin/cucumber
#!/usr/bin/env ruby
...


# Broken files
#---------------------------------------------------------------------

# rake : (broken, first line of executable)

$ cat ~/.rvm/gems/ruby-1.8.7-p352@ykiw/bin/rake
#!/home/eric/.rvm/rubies/ruby-1.8.7-p334/bin/ruby
...


# bundle : (broken, first line of executable)

$ cat ~/.rvm/gems/ruby-1.8.7-p352@ykiw/bin/bundle
#!/home/eric/.rvm/rubies/ruby-1.8.7-p334/bin/ruby
...



# Other notes
#---------------------------------------------------------------------
# I was able to fix the bundler path by running "gem install bundler",
# which updated bundler to the newest version.  I presume that if
# bundler was already up to date, this may not have worked.
#
# From what I've read, RubyGems makes these convenience executables
# upon "gem install".  I don't understand the discrepancy in the 
# ruby path interpreter for different files, though.  Perhaps this 
# has to do with configurations chosen by the gem authors?