There is a bug report on Debian's BTS says the desktop pager have serious problems reacting on mouse
clicks since update to 0.5.4.1 and still persists in 0.5.5.
See details: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=567617
Testing with Openbox and Compiz, I see nothing out of the ordinary. This will have to be tracked down by someone who is experiencing this.
I believe this issue is completely fixed in the latest version of the LXPanel. Test it, please, and let us know if something is still wrong. Thank you very much.