I'm using Ruby 1.8.4.

This is no problem.

$ ruby ~/'Ruby Stuff'/fibtimes.rb
<correct output>

When I do this, there is a problem.

irb(main):001:0> require "~/'Ruby Stuff'/fibitmes.rb"
LoadError: no such file to load -- ~/'Ruby Stuff'/fibtimes.rb
        from (irb):1:in `require'
        from (irb):1

I get this even when I use the expanded home path instead of ~.
I also get this error using 'load' instead of 'require'.

I this a bug in the irb parser?