rails console: Could not find 'rack'

[Hiisi]

Hi, list!
The system is F20. I upgraded it from F17 through F18 a few days ago.
Everything works perfect except that neither rails console nor rails server
won't start. Typing rails console in the terminal leads to the following
result:
/usr/share/rubygems/rubygems/dependency.rb:298:in `to_specs': Could not
find 'rack' (~> 1.2.1) - did find: [rack-1.5.2,rack-1.4.0] (Gem::LoadError)
from /usr/share/rubygems/rubygems/specification.rb:1268:in `block in
activate_dependencies'
 from /usr/share/rubygems/rubygems/specification.rb:1257:in `each'
from /usr/share/rubygems/rubygems/specification.rb:1257:in
`activate_dependencies'
 from /usr/share/rubygems/rubygems/specification.rb:1239:in `activate'
from /usr/share/rubygems/rubygems/specification.rb:1271:in `block in
activate_dependencies'
 from /usr/share/rubygems/rubygems/specification.rb:1257:in `each'
from /usr/share/rubygems/rubygems/specification.rb:1257:in
`activate_dependencies'
 from /usr/share/rubygems/rubygems/specification.rb:1239:in `activate'
from /usr/share/rubygems/rubygems/core_ext/kernel_gem.rb:48:in `gem'
 from /usr/local/bin/rails:22:in `<main>'
I've tried every possible solution I saw on the web but with no luck. Any
thoughts?
P.S. gem list reveals rack available:
rack (1.5.2, 1.4.0)
rack-accept (0.4.3)
rack-cache (1.2)
rack-mount (0.8.3, 0.7.1)
rack-protection (1.5.0)
rack-restful_submit (1.2.2)
rack-ssl (1.3.2)
rack-test (0.6.2, 0.6.0
TIA
-- 
Hiisi.
Registered Linux User #487982. Be counted at: https://linuxcounter.net/
--
Spandex is a privilege, not a right.
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