Ah - that Privkey you gave me is the actual privkey for an xJDC address. Did you specify the -P flag and the pubkey? It looks like either you didn't, or oclvanitygen is ignoring it.
yes, -P dosnt work for OCL

it was ignored.
It isn't ignored for me. If I copy it wrong it complains, and if I get it right it accepts it and goes on to find that I don't have a suitable video card:
$ ./oclvanitygen -CkP xx8F08DCB868F3C22397BF5BAE1F19DE55F4D936AF66DC144E098F69A488FE3266A14FDCDAFBD1897F034AA54CAE13D2AB9A9D96B487A263594F408100D6DCC0FB xJDCLAMZ
Invalid base pubkey
$ ./oclvanitygen -CkP 048F08DCB868F3C22397BF5BAE1F19DE55F4D936AF66DC144E098F69A488FE3266A14FDCDAFBD1897F034AA54CAE13D2AB9A9D96B487A263594F408100D6DCC0FB xJDCLAMZ
Difficulty: 888446610538
clGetPlatformIDs(0): Unknown code -1001
clGetPlatformIDs(0): Unknown code -1001
Available OpenCL platforms:
$
oclvanitygen has no working -P switch... also check --help
./oclvanitygen -CkP 048F08DCB868F3C22397BF5BAE1F19DE55F4D936AF66DC144E098F69A488FE3266A14FDCDAFBD1897F034AA54CAE13D2AB9A9D96B487A263594F408100D6DCC0FB xJDCLAMZ
Invalid character '0' in prefix '048F08DCB868F3C22397BF5BAE1F19DE55F4D936AF66DC144E098F69A488FE3266A14FDCDAFBD1897F034AA54CAE13D2AB9A9D96B487A263594F408100D6DCC0FB'
Difficulty: 888446610538
[32.19 Mkey/s][total 209715200][Prob 0.0%][50% in 5.3h]