I've got the same picture (transparent backgrounds) when clicked on "Report" section on an avatar pie menu (no, I have no intent to report any abuse, it was a mis-click; and then I have a hard time realizing how NOT to send it

). I have not touched any graphics settings. Viewer details below:
Cool VL Viewer 1.23.5 (31) Oct 2 2010 18:54:27 (Cool VL Viewer)
Release Notes
Built with MSVC version 1400
CPU: AMD (Unknown model) (3008 MHz)
Memory: 3200 MB
OS Version: Microsoft Windows XP Service Pack 3 (Build 2600)
Graphics Card Vendor: NVIDIA Corporation
Graphics Card: GeForce GT 220/PCI/SSE2/3DNOW!
Windows Graphics Driver Version: 6.14.0011.9107
OpenGL Version: 3.2.0
libcurl Version: libcurl/7.18.1 OpenSSL/0.9.8j zlib/1.2.3