As announced last October, malware data has been moved from PH to a new list MW, taking the bit of OB, which was deprecated last year. Along with malware data, limited set of cracked hosts also has been moved from PH to MW, in part because cracked sites often have or can have malware on them.
The bitmask bit 16 therefore is no longer used by OB, but is used by MW now. Please update configurations appropriately. For example in SpamAssassin, change:
urirhssub URIBL_OB_SURBL multi.surbl.org. A 16 body URIBL_OB_SURBL eval:check_uridnsbl('URIBL_OB_SURBL') describe URIBL_OB_SURBL Contains an URL listed in the OB SURBL blocklist tflags URIBL_OB_SURBL net reuse URIBL_OB_SURBL
score URIBL_OB_SURBL 0 0.785 0 0.122
to:
urirhssub URIBL_MW_SURBL multi.surbl.org. A 16 body URIBL_MW_SURBL eval:check_uridnsbl('URIBL_MW_SURBL') describe URIBL_MW_SURBL Contains an URL listed in the MW SURBL blocklist tflags URIBL_MW_SURBL net reuse URIBL_MW_SURBL
score URIBL_MW_SURBL 0 0.001 0 0.610
Please direct followup discussion to the SURBL Discussion list.