Greetings, I use NW65 SP7, and this problem occurs some times in a year. Then arises to server reboot.
Thanks,

30/03/2009 8:51:01 : SERVER-5.70-834
Severity = 5 Locus = 1 Class = 19
Function Free received invalid pointer 0x4CD43280

30/03/2009 9:00:07 : SERVER-5.70-834
Severity = 5 Locus = 1 Class = 19
Function Free received invalid pointer 0x1F0DC020