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v 4.0.8 works great Rated 5 out of 5 stars
I've been using v 4.0.8 with perfect results. Gained lots of usable screen space combining tool-bars.
Customized buttons both in location and appearance made a screen just like I wanted.
Been using 4.0.9 beta (release May 28, 2011) without problems. Love putting the tabs in the TITLE-BAR new in this version.
You need to reinstall CCO v4.0.9
Last night I discovered a bug in CCO v4.0.9, which would cause the main window to come up blank when Firefox was started under certain conditions. The issue has been fixed and a new build of v4.0.9 has been uploaded. However, anyone who has installed CCO v4.0.9 prior to May 31, 2011 needs to reinstall it to get the patch. You can read all about the bug and how I fixed it at: http://forums.mozillazine.org/viewtopic.php?p=10858883#p10858883