I've been having the same problem:

kai@Kai-Desktop:~$ compiz --replace
Checking for Xgl: not present. 
xset q doesn't reveal the location of the log file. Using fallback /var/log/Xorg.0.log 
Detected PCI ID for VGA: 
Checking for texture_from_pixmap: present. 
Checking for non power of two support: present. 
Checking for Composite extension: present. 
Checking screen 1Comparing resolution (1680x1050) to maximum 3D texture size (8192): Passed.
Checking for Software Rasterizer: Not present. 
Checking for nVidia: present. 
Checking for FBConfig: present. 
running under gnome seesion, checking for gnomecompat
Checking for Xgl: not present. 
*** glibc detected *** /usr/bin/compiz.real: double free or corruption (!prev): 0x0a176918 ***
======= Backtrace: =========
/lib/tls/i686/cmov/libc.so.6[0xb7c9e604]
/lib/tls/i686/cmov/libc.so.6(cfree+0x96)[0xb7ca05b6]
/usr/lib/libGL.so.1[0xb7e1c3e1]
======= Memory map: ========
08048000-0807c000 r-xp 00000000 08:05 1605791    /usr/bin/compiz.real
0807c000-0807d000 r--p 00033000 08:05 1605791    /usr/bin/compiz.real
0807d000-0807e000 rw-p 00034000 08:05 1605791    /usr/bin/compiz.real
09f2c000-0a1ef000 rw-p 09f2c000 00:00 0          [heap]
b624e000-b6258000 r-xp 00000000 08:05 730458     /lib/tls/i686/cmov/libnss_files-2.9.so
b6258000-b6259000 r--p 00009000 08:05 730458     /lib/tls/i686/cmov/libnss_files-2.9.so
b6259000-b625a000 rw-p 0000a000 08:05 730458     /lib/tls/i686/cmov/libnss_files-2.9.so
b625a000-b6263000 r-xp 00000000 08:05 730462     /lib/tls/i686/cmov/libnss_nis-2.9.so
b6263000-b6264000 r--p 00008000 08:05 730462     /lib/tls/i686/cmov/libnss_nis-2.9.so
b6264000-b6265000 rw-p 00009000 08:05 730462     /lib/tls/i686/cmov/libnss_nis-2.9.so
b6265000-b627a000 r-xp 00000000 08:05 730452     /lib/tls/i686/cmov/libnsl-2.9.so
b627a000-b627b000 r--p 00014000 08:05 730452     /lib/tls/i686/cmov/libnsl-2.9.so
b627b000-b627c000 rw-p 00015000 08:05 730452     /lib/tls/i686/cmov/libnsl-2.9.so
b627c000-b627e000 rw-p b627c000 00:00 0 
b627e000-b6285000 r-xp 00000000 08:05 730454     /lib/tls/i686/cmov/libnss_compat-2.9.so
b6285000-b6286000 r--p 00006000 08:05 730454     /lib/tls/i686/cmov/libnss_compat-2.9.so
b6286000-b6287000 rw-p 00007000 08:05 730454     /lib/tls/i686/cmov/libnss_compat-2.9.so
b6287000-b62b7000 r-xp 00000000 08:05 712819     /lib/libpcre.so.3.12.1
b62b7000-b62b8000 r--p 0002f000 08:05 712819     /lib/libpcre.so.3.12.1
b62b8000-b62b9000 rw-p 00030000 08:05 712819     /lib/libpcre.so.3.12.1
b62b9000-b62f5000 r-xp 00000000 08:05 1608691    /usr/lib/libgobject-2.0.so.0.2000.1
b62f5000-b62f6000 r--p 0003b000 08:05 1608691    /usr/lib/libgobject-2.0.so.0.2000.1
b62f6000-b62f7000 rw-p 0003c000 08:05 1608691    /usr/lib/libgobject-2.0.so.0.2000.1
b62f7000-b632d000 r-xp 00000000 08:05 712759     /lib/libdbus-1.so.3.4.0
b632d000-b632e000 r--p 00035000 08:05 712759     /lib/libdbus-1.so.3.4.0
b632e000-b632f000 rw-p 00036000 08:05 712759     /lib/libdbus-1.so.3.4.0
b632f000-b634b000 r-xp 00000000 08:05 1608470    /usr/lib/libdbus-glib-1.so.2.1.0
b634b000-b634c000 r--p 0001b000 08:05 1608470    /usr/lib/libdbus-glib-1.so.2.1.0
b634c000-b634d000 rw-p 0001c000 08:05 1608470    /usr/lib/libdbus-glib-1.so.2.1.0
b634d000-b6354000 r-xp 00000000 08:05 730471     /lib/tls/i686/cmov/librt-2.9.so
b6354000-b6355000 r--p 00006000 08:05 730471     /lib/tls/i686/cmov/librt-2.9.so
b6355000-b6356000 rw-p 00007000 08:05 730471     /lib/tls/i686/cmov/librt-2.9.so
b6356000-b635a000 r-xp 00000000 08:05 1608769    /usr/lib/libgthread-2.0.so.0.2000.1
b635a000-b635b000 r--p 00003000 08:05 1608769    /usr/lib/libgthread-2.0.so.0.2000.1
b635b000-b635c000 rw-p 00004000 08:05 1608769    /usr/lib/libgthread-2.0.so.0.2000.1
b635c000-b635f000 r-xp 00000000 08:05 1608649    /usr/lib/libgmodule-2.0.so.0.2000.1
b635f000-b6360000 r--p 00002000 08:05 1608649    /usr/lib/libgmodule-2.0.so.0.2000.1
b6360000-b6361000 rw-p 00003000 08:05 1608649    /usr/lib/libgmodule-2.0.so.0.2000.1
b6361000-b63aa000 r-xp 00000000 08:05 1608265    /usr/lib/libORBit-2.so.0.1.0
b63aa000-b63b2000 r--p 00049000 08:05 1608265    /usr/lib/libORBit-2.so.0.1.0
b63b2000-b63b4000 rw-p 00051000 08:05 1608265    /usr/lib/libORBit-2.so.0.1.0
b63b4000-b646a000 r-xp 00000000 08:05 1608637    /usr/lib/libglib-2.0.so.0.2000.1
b646a000-b646b000 r--p 000b5000 08:05 1608637    /usr/lib/libglib-2.0.so.0.2000.1
b646b000-b646c000 rw-p 000b6000 08:05 1608637    /usr/lib/libglib-2.0.so.0.2000.1
b646c000-b649a000 r-xp 00000000 08:05 1608573    /usr/lib/libgconf-2.so.4.1.5
b649a000-b649b000 ---p 0002e000 08:05 1608573    /usr/lib/libgconf-2.so.4.1.5
b649b000-b649c000 r--p 0002e000 08:05 1608573    /usr/lib/libgconf-2.so.4.1.5
b649c000-b649e000 rw-p 0002f000 08:05 1608573    /usr/lib/libgconf-2.so.4.1.5
b64ab000-b64b8000 r-xp 00000000 08:05 712769     /lib/libgcc_s.so.1
b64b8000-b64b9000 r--p 0000c000 08:05 712769     /lib/libgcc_s.so.1
b64b9000-b64ba000 rw-p 0000d000 08:05 712769     /lib/libgcc_s.so.1
b64ba000-b659e000 r-xp 00000000 08:05 1609166    /usr/lib/libstdc++.so.6.0.10
b659e000-b65a2000 r--p 000e3000 08:05 1609166    /usr/lib/libstdc++.so.6.0.10
b65a2000-b65a3000 rw-p 000e7000 08:05 1609166    /usr/lib/libstdc++.so.6.0.10
b65a3000-b65a9000 rw-p b65a3000 00:00 0 
b65a9000-b65be000 r-xp 00000000 08:05 730467     /lib/tls/i686/cmov/libpthread-2.9.so
b65be000-b65bf000 r--p 00014000 08:05 730467     /lib/tls/i686/cmov/libpthread-2.9.so
b65bf000-b65c0000 rw-p 00015000 08:05 730467     /lib/tls/i686/cmov/libpthread-2.9.so
b65c0000-b65c2000 rw-p b65c0000 00:00 0 
b65c2000-b6696000 r-xp 00000000 08:05 1609052    /usr/lib/libprotobuf.so.3.0.0
b6696000-b6698000 r--p 000d3000 08:05 1609052    /usr/lib/libprotobuf.so.3.0.0
b6698000-b6699000 rw-p 000d5000 08:05 1609052    /usr/lib/libprotobuf.so.3.0.0
b6699000-b66dc000 r-xp 00000000 08:05 1608442    /usr/lib/libcompizconfig.so.0.0.0
b66dc000-b66dd000 r--p 00043000 08:05 1608442    /usr/lib/libcompizconfig.so.0.0.0
b66dd000-b66de000 rw-p 00044000 08:05 1608442    /usr/lib/libcompizconfig.so.0.0.0
b66e0000-b66e9000 r-xp 00000000 08:05 1630599    /usr/lib/compizconfig/backends/libgconf.so
b66e9000-b66ea000 r--p 00008000 08:05 1630599    /usr/lib/compizconfig/backends/libgconf.so
b66ea000-b66eb000 rw-p 00009000 08:05 1630599    /usr/lib/compizconfig/backends/libgconf.so
b66f0000-b68f0000 rw-s 340ae000 00:0f 7660       /dev/nvidia0
b68f0000-b68f4000 rw-s 340a8000 00:0f 7660       /dev/nvidia0
b68f4000-b69f4000 rw-s 340f9000 00:0f 7660       /dev/nvidia0
b69f4000-b69f5000 rw-s fdc06000 00:0f 7660       /dev/nvidia0
b69f5000-b6a35000 rw-s 34f3f000 00:0f 7660       /dev/nvidia0
b6a35000-b6a55000 rw-s 34f5f000 00:0f 7660       /dev/nvidia0
b6b72000-b6ba6000 rw-p b6b72000 00:00 0 
b6ba6000-b6bc7000 rw-s 00000000 00:09 0          /SYSV00000000 (deleted)
b6bc7000-b6bc8000 rw-p b6bc7000 00:00 0 
b6bc8000-b6bcc000 r-xp 00000000 08:05 1608292    /usr/lib/libXdmcp.so.6.0.0
b6bcc000-b6bcd000 rw-p 00003000 08:05 1608292    /usr/lib/libXdmcp.so.6.0.0
b6bcd000-b6bce000 rw-p b6bcd000 00:00 0 
b6bce000-b6bd0000 r-xp 00000000 08:05 1608281    /usr/lib/libXau.so.6.0.0
b6bd0000-b6bd1000 r--p 00001000 08:05 1608281    /usr/lib/libXau.so.6.0.0
b6bd1000-b6bd2000 rw-p 00002000 08:05 1608281    /usr/lib/libXau.so.6.0.0
b6bd2000-b6bea000 r-xp 00000000 08:05 1609249    /usr/lib/libxcb.so.1.1.0
b6bea000-b6beb000 r--p 00017000 08:05 1609249    /usr/lib/libxcb.so.1.1.0
b6beb000-b6bec000 rw-p 00018000 08:05 1609249    /usr/lib/libxcb.so.1.1.0
b6bec000-b6bed000 r-xp 00000000 08:05 1631831    /usr/lib/tls/libnvidia-tls.so.180.44
b6bed000-b6bee000 rw-p 00000000 08:05 1631831    /usr/lib/tls/libnvidia-tls.so.180.44
b6bee000-b7908000 r-xp 00000000 08:05 1608472    /usr/lib/libGLcore.so.180.44
b7908000-b7afa000 rwxp 00d19000 08:05 1608472    /usr/lib/libGLcore.so.180.44
b7afa000-b7b06000 rwxp b7afa000 00:00 0 
b7b06000-b7b1a000 r-xp 00000000 08:05 712865     /lib/libz.so.1.2.3.3
b7b1a000-b7b1b000 r--p 00013000 08:05 712865     /lib/libz.so.1.2.3.3
b7b1b000-b7b1c000 rw-p 00014000 08:05 712865     /lib/libz.so.1.2.3.3
b7b1c000-b7b1d000 rw-p b7b1c000 00:00 0 
b7b1d000-b7b20000 r-xp 00000000 08:05 712858     /lib/libuuid.so.1.2
b7b20000-b7b21000 r--p 00002000 08:05 712858     /lib/libuuid.so.1.2
b7b21000-b7b22000 rw-p 00003000 08:05 712858     /lib/libuuid.so.1.2
b7b22000-b7b2a000 r-xp 00000000 08:05 1608316    /usr/lib/libXrender.so.1.3.0
b7b2a000-b7b2b000 r--p 00007000 08:05 1608316    /usr/lib/libXrender.so.1.3.0
b7b2b000-b7b2c000 rw-p 00008000 08:05 1608316    /usr/lib/libXrender.so.1.3.0
b7b2c000-b7b2e000 r-xp 00000000 08:05 730447     /lib/tls/i686/cmov/libdl-2.9.so
b7b2e000-b7b2f000 r--p 00001000 08:05 730447     /lib/tls/i686/cmov/libdl-2.9.so
b7b2f000-b7b30000 rw-p 00002000 08:05 730447     /lib/tls/i686/cmov/libdl-2.9.so
b7b30000-b7b3e000 r-xp 00000000 08:05 1608294    /usr/lib/libXext.so.6.4.0
b7b3e000-b7b3f000 r--p 0000d000 08:05 1608294    /usr/lib/libXext.so.6.4.0
b7b3f000-b7b40000 rw-p 0000e000 08:05 1608294    /usr/lib/libXext.so.6.4.0
b7b40000-b7c2a000 r-xp 00000000 08:05 1608275    /usr/lib/libX11.so.6.2.0
b7c2Aborted

Does anyone have any idea when there's going to be a fix for this? Is this going to be in the Jaunty Jackelope final release?