Apple file server crashes constantly

I connect my xserver to m$ AD and use acl's - this seems to work fine until recently. I have started to use the acl's to deny permissions to certain directories. Now i seem to constantly get apple file server errors and it randomly kicks everyone off the server every morning - if i restart all will work until the following morning.

Initially i thought it was because there was no slapd.conf - fixed this and all seemed well. However now am getting this issue:

com.apple. (com.apple.AppleFileServer Exited abnormally Bus error

more detial here:

Process: AppleFileServer [26022]
Path: /usr/sbin/AppleFileServer
Identifier: AppleFileServer
Version: ??? (???)
Code Type: X86 (Native)
Parent Process: launchd [1]

Date/Time: 2009-04-14 10:01:44.384 +0100
OS Version: Mac OS X Server 10.5.6 (9G71)
Report Version: 6

Exception Type: EXC BADACCESS (SIGBUS)
Exception Codes: KERN PROTECTIONFAILURE at 0x0000000000000015
Crashed Thread: 84

Thread 0:
0 libSystem.B.dylib 0x965c26f2 select$DARWIN_EXTSN + 10
1 AppleFileServer 0x000720cb OSRef<AFPRequest>::OSRef(AFPRequest*) + 2345
2 AppleFileServer 0x0003264d OSRef<SessionManager>::operator=(OSRef<SessionManager> const&) + 2245
3 AppleFileServer 0x000443a9 OSTree Protected::~OSTreeProtected() + 433
4 AppleFileServer 0x00044483 OSTree Protected::~OSTreeProtected() + 651
5 AppleFileServer 0x00042158 OSRef<FPVol>::OSRef(FPVol*) + 1082
6 AppleFileServer 0x00001ffe 0x1000 + 4094

Thread 1:
0 libSystem.B.dylib 0x965731c6 mach msgtrap + 10
1 libSystem.B.dylib 0x9657a9bc mach_msg + 72
2 com.apple.CoreFoundation 0x924980ae CFRunLoopRunSpecific + 1790
3 com.apple.CoreFoundation 0x92498d34 CFRunLoopRun + 84
4 AppleFileServer 0x0003578d OSRef<FPCNode>::~OSRef() + 1105
5 AppleFileServer 0x000443a9 OSTree Protected::~OSTreeProtected() + 433
6 AppleFileServer 0x00044483 OSTree Protected::~OSTreeProtected() + 651
7 libSystem.B.dylib 0x965a4095 pthreadstart + 321
8 libSystem.B.dylib 0x965a3f52 thread_start + 34