title: rvm 1.10.1 can't set a gemset as default
body: <p>I have 3 gemsets</p>
  
  <pre><code> $rvm gemset list
  
     gemsets for ruby-1.9.2-p290 (found in /home/railsu/.rvm/gems/ruby-1.9.2-p290)
     global
     rails31
     rails311
  </code></pre>
  
  <p>then I run</p>
  
  <pre><code>$rvm use 1.9.2@rails311 --default
  Using /home/railsu/.rvm/gems/ruby-1.9.2-p290 with gemset rails311
  $rvm current
  ruby-1.9.2-p290@rails311
  $rails -v
  rails 3.1.1
  </code></pre>
  
  <p>It looks good,but:</p>
  
  <pre><code> $rvm default
   $rvm current 
   ruby-1.9.2-p290
  </code></pre>
  
  <p>There is not rails311 gemset in default. 
  I try this on other user which rvm's version is 1.8.6,and it work.I get </p>
  
  <pre><code>$rvm default
  $rvm current
  ruby-1.9.2-p290@rails311
  </code></pre>
  
  <p>What's the problem?</p>