unity_support_test crashed with SIGSEGV in nux::GLFramebufferObject::_GenerateFboId()

I'm using an old Radeon card with open-source driver and "nomodeset" option because otherwise it shows black screen on boot. Compiz crashed on startup, then this app also crashed. I know this info is not very helpful, but I'll try to collect and provide more info.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: nux-tools 0.9.28-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
Uname: Linux 2.6.38-5-generic i686
Architecture: i386
Date: Sat Feb 26 14:04:12 2011
Disassembly: => 0x0: Cannot access memory at address 0x0
ExecutablePath: /usr/lib/nux/unity_support_test
LiveMediaBuild: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110226)
ProcCmdline: /usr/lib/nux/unity_support_test
ProcEnviron:
 LANGUAGE=ru_RU:en
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0x0: Cannot access memory at address 0x0
 PC (0x00000000) not located in a known VMA region (needed executable region)!
SegvReason: executing NULL VMA
Signal: 11
SourcePackage: nux
StacktraceTop:
 ?? ()
 nux::GLFramebufferObject::_GenerateFboId() () from /usr/lib/libnux-graphics-0.9.so.0
 nux::GLFramebufferObject::GLFramebufferObject() () from /usr/lib/libnux-graphics-0.9.so.0
 nux::IOpenGLFrameBufferObject::IOpenGLFrameBufferObject(char const*, int) () from /usr/lib/libnux-graphics-0.9.so.0
 nux::GpuDevice::CreateFrameBufferObject(nux::IOpenGLFrameBufferObject**) () from /usr/lib/libnux-graphics-0.9.so.0
Title: unity_support_test crashed with SIGSEGV in nux::GLFramebufferObject::_GenerateFboId()
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
XsessionErrors:
 (gnome-settings-daemon:2846): Gdk-CRITICAL **: IA__gdk_window_thaw_toplevel_updates_libgtk_only: assertion `private->update_and_descendants_freeze_count > 0' failed
 (nautilus:2912): GConf-CRITICAL **: gconf_value_free: assertion `value != NULL' failed