I just removed some effects using ccsm, switched to the AMD proprietary driver, rebooted and after I log in, the unity panel is no longer there. If I hit the windows key or the alt key, nothing happens. I can hit ctrl+alt+t to get a terminal (and thus launch apps via commandline).

Does anyone know how I can fix this? What logs do I need to post here for help?

Edit #1:

As suggested by @cprofitt I just ran:

dconf reset -f /org/compiz/ && setsid unity

I'm seeing some compiz messages in the terminal now:

unity-panel-service: no process found

compiz (core) - Info: Loading plugin: core

compiz (core) - Info: Starting plugin: core

compiz (core) - Info: Loading plugin: ccp

compiz (core) - Info: Starting plugin: ccp

compizconfig - Info: Backend     : gsettings

compizconfig - Info: Integration : true

compizconfig - Info: Profile     : unity

compiz (core) - Info: Loading plugin: composite

compiz (core) - Info: Starting plugin: composite

compiz (core) - Info: Loading plugin: opengl

X Error of failed request:  BadRequest (invalid request code or no such operation)

  Major opcode of failed request:  155 (ATIFGLEXTENSION)

  Minor opcode of failed request:  66 ()

  Serial number of failed request:  23

  Current serial number in output stream:  23

compiz (core) - Info: Unity is not supported by your hardware. Enabling software rendering instead (slow).

X Error of failed request:  BadRequest (invalid request code or no such operation)

  Major opcode of failed request:  155 (ATIFGLEXTENSION)

  Minor opcode of failed request:  66 ()

  Serial number of failed request:  23

  Current serial number in output stream:  23

compiz (core) - Info: Unity is not supported by your hardware. Enabling software rendering instead (slow).

compiz (core) - Info: Starting plugin: opengl

Compiz (opengl) - Fatal: glXQueryExtensionsString is NULL for screen 0

compiz (core) - Error: Plugin initScreen failed: opengl

compiz (core) - Error: Failed to start plugin: opengl

compiz (core) - Info: Unloading plugin: opengl

compiz (core) - Info: Loading plugin: compiztoolbox

compiz (core) - Info: Starting plugin: compiztoolbox

compiz (core) - Error: Plugin 'opengl' not loaded.