looks like "gem update" killed my application.
it was a very simplistic application that i carefully cooked under
after the selfprepared recipe:
not sure if a strange*) gem rails-18.104.22.16806 was an indirect killer,
but definitely as for now I am
motivated to use plugins more, more and more...
Comments to this bloggy post are welcome.
*) try to google for "rails-22.214.171.12406" i got only TWO pages, both are
in Polish language