[Update] As of June 5, issue is fixed with latest round of updates.
The latest FileZilla (3.5.3) that installs with Kubuntu-12.04 crashes when using the FileZilla Site Manager. This FileZilla behavior is actually caused by a bug in oxygen-gtk2 (1.2.1) which is the latest version that comes with Kubuntu-12.04.
Apparently this oxygen-gtk2 behavior occurs with versions 1.2.2 onwards but not with the 1.2.0 (older) version. It is fixed in oxygen-gtk2 1.2.3. but…. you’ll have to compile it (yuck).
For me the oxygen-gtk2 bug only seems to affect FileZilla so I’m not that keen on compiling a version 1.2.3 just to get FileZilla to behave. So here are a 2 work-arounds.
1. Use the “Raleigh” GTK+ Style instead of the default oxygen-gtk (style). FileZilla works properly but looks fugly. Firefox will also look funky.
Go to: System Settings | Application Appearance | GTK+ Appearance
For the “Widget style”: Choose Raleigh
2. In FileZilla, open a Quick Connection FIRST before tying to use the Site Manager. After a Quick Connection session is initiated the FileZilla + Site Manager behaves properly. Just make sure to ADD the second (Site Manager) session and not replace the first one (Establish a New Connection). Of course, you ‘ll need to keep the first (Quick Connect) session connected while you’re working on any sessions.
Since oxygen-gtk2 folks have already released a fixed version, I’ll just sit back a while and wait for the updated version.