Comment 3 for bug 886315

This Blogpost has a workaround
http://easylinuxguide.com/blog/2011/06/16/filezilla-drag-and-drop-crash-fix-ubuntu-natty/

This post is for natty but it's the same problem with oneiric.
wxwidgets is still version 2.8.11

I manually downloaded and installed the following packages in this order from the natty-repository because there is no oneiric repo:
http://apt.wxwidgets.org/dists/natty-wx/main/binary-amd64/

libwxbase2.8-0_2.8.12.0-0_amd64.deb
libwxgtk2.8-0_2.8.12.0-0_amd64.deb
python-wxgtk2.8_2.8.12.0-0_amd64.deb
(you may have to install libesd0, too)

there is also a i386 repo
http://apt.wxwidgets.org/dists/natty-wx/main/binary-i386/

Now drag and drop works!