I have IE8, OS is WinXP Pro SP3. Using Sandboxie to isolate disk activity from my browsers, if that's a problem. Didn't used to be in an earlier build of this machine. Dunno what else might be relevant. I may just rebuild the OS setup and try again, since I've been using this setup for a while, and it's about due for a thorough clean-out.

Works great, thanks.

aiai... I meant to do a new version of that guide. ...one that made sense...

Initialize your variable in the correct scope. <span class="syntaxdefault"><br />class My_Tool<br />   def initialize<br />     </span><span class="syntaxkeyword">@</span><span class="syntaxdefault">ip1 </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> Sketchup</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">InputPoint</span><span class="syntaxkeyword">.new<br /></span><span class="syntaxdefault">     </span><span class="syntaxkeyword">@</span><span class="syntaxdefault">ip2 </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> Sketchup</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">InputPoint</span><span class="syntaxkeyword">.new<br /></span><span class="syntaxdefault">     </span><span class="syntaxkeyword">@</span><span class="syntaxdefault">point_flag </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> 1<br />   end<br /><br />   def activate<br />      puts </span><span class="syntaxstring">"Activate"<br /></span><span class="syntaxdefault">   end<br /></span> Explanation: http://sporkmonger.com/2007/2/19/instance-variables-class-variables-and-inheritance-in-ruby http://railstips.org/blog/archives/2006/11/18/class-and-instance-variables-in-ruby/