Arch Linux just updated to libpng 1.4, which doesn't work with the current "All distribution" binary.
Here the error:
jim@athlon:~$ VirtualBox
VirtualBox: supR3HardenedMainGetTrustedMain: dlopen("/opt/VirtualBox/VirtualBox.so",) failed: libpng12.so.0: cannot open shared object file: No such file or directory
jim@athlon:~$