error when tryring to copy any element in a test plan

I'm using JMeter 2.10.  For a particular test script, I get an error any time I try to copy an element in the test plan. 

Error is:
Error
An error occurred while copying node:
com.sun.java.swing.plaf.widows.XPStyle

Any thoughts?  The script loads and runs without issue.  I can save changes to it.  Just can't copy anything in it.

Thanks,

Glenn