virtualenvwrapper .hook problem

Question

I've used virtualenvwrapper, but I'm having problems running it on a new computer. My .bashrc file is updated per the instructions:

export WORKON_HOME=$DEV_HOME/projects
source /usr/local/bin/virtualenvwrapper.sh

But when source is run, I get the following:

bash: /25009.hook: Permission denied
bash: /25009.hook: No such file or directory

This previous post leads me to believe the filename is being recycled and locked because virtualenvwrapper.sh uses $$. Is there any way to fix this?