Starting from ADF2009.01 the default PBE functional uses LDA PW92, instead of LDA VWN, and uses for the GGA part routines provided by Burke.
Before this bug-fix the 'correct' PBE functional could be obtained with explicit specifying the LDA PW92 functional and the correct PBEc correlation functional:
XC LDA PW92 GGA PBE USEBURKEROUTINES End
Now this is default if one uses
XC GGA PBE End
The old ('incorrect') defaults can be calculated with
XC LDA VWN GGA PBE USESPROUTINES End
