Same!
I was on version 5.3.1 on my Windows 2000 desktop at work. I upgraded to 5.4.3 and lost the toolbar. Tried a few things like changing themes - no luck at all. I downloaded and installed 5.4.2 and it works fine. Tried installing 5.4.3 again just in case the upgrade jump was too big, but still no dice. Back to 5.4.2 and it works fine.
Installed 5.4.3 in my Windoze XP laptop at home and...
2009-06-17 08:58:38 UTC in Notepad++