I'm running Kubuntu 12.04 and I just upgraded this monring from version 11.
I found that slickedit is having a problem with the upgrade.
When I right click in the source window, I don't get the drop down menu anymore. Also, when I scroll the souce window it's very choppy.
I've tried this on two different installs of Ubuntu 12.0.4. One is in a virtual machine, the other is a desktop machine.
The desktop install works perfectly.
The virtual machine (VMWare) install couldn't display the context menu and due to the slower graphics output couldn't keep up with the keyboard when I had it maxed out (not bad though). It looks like the problem with the context menu not coming up is some sort of mouse driver bug. Combo boxes in Ubuntu unity (like the ones in the Display settings) wouldn't work properly. SlickEdit isn't the only application having problems. I don't think I installed the latest updates on this install though.
Are you running in a virtual machine (VMWare)? Did you install all the Ubuntu updates?
Attached is a work around for the mouse driver bug which works with SlickEdit 16.0.3. This won't help you with things like combo boxes not working in other applications. Use Macro>Load Module... to load this macro.