CW10 asm error

In upgrading my project from CW 9.5 to 10.0, I've run into a set of 
seemingly bogus errors compiling a file containing inline assembly.  The 
errors look like:

Error   : 'lbz' is not a struct/union/class member
PalmUserManager.cpp line 116       lbz  r4, iIsProfileUser 

Error   : 'lwz' is not a struct/union/class member
PalmUserManager.cpp line 317       lwz  r4, oUserID 

Error   : 'lwz' is not a struct/union/class member
PalmUserManager.cpp line 347       lwz  r5, iKeyName 

Error   : 'lwz' is not a struct/union/class member
PalmUserManager.cpp line 349       lwz  r7, oValue 

Error   : 'lwz' is not a struct/union/class member
PalmUserManager.cpp line 379       lwz  r5, iKeyName 

Error   : 'mr' is not a struct/union/class member
PalmUserManager.cpp line 381       mr  r12, tv 

The frustrating thing about these errors is that they seem to be on 
random lines of assembly code.  Some functions compile fine, and others 
get errors, with no apparent pattern.  For instance, in the following 
code, the first function compiles fine and the second gets an error:

   OSStatus GetUserNameByID(PalmUserID iUserID, CFStringRef * oUserName)
   {
   #if __MACH__
      static void * tvector = GetFunction("\pUmGetUserNameByID");

      register void * tv = tvector;
      if (tv != 0) {
         register OSStatus result;
         asm {
            .volatile
            lwz      r3, iUserID
            lwz      r4, oUserName
            mr    r12, tv
            lwz      RTOC, 4(tv)
            lwz      r0, 0(tv)
            mtctr r0
            bctrl
            mr    result, r3
         }
         return result;
      }
      else return gLastLibraryError;
   #else
      if (::UmGetUserNameByID == 0) return cfragNoLibraryErr;
      else return ::UmGetUserNameByID(iUserID, oUserName);
   #endif
   }


   OSStatus GetIDFromName(CFStringRef iUserName, PalmUserID * oUserID)
   {
   #if __MACH__
      static void * tvector = GetFunction("\pUmGetIDFromName");

      register void * tv = tvector;
      if (tv != 0) {
         register OSStatus result;
         asm {
            .volatile
            lwz      r3, iUserName
            lwz      r4, oUserID
            mr    r12, tv
            lwz      RTOC, 4(tv)
            lwz      r0, 0(tv)
            mtctr r0
            bctrl
            mr    result, r3
         }
         return result;
      }
      else return gLastLibraryError;
   #else
      if (::UmGetIDFromName == 0) return cfragNoLibraryErr;
      else return ::UmGetIDFromName(iUserName, oUserID);
   #endif
   }

I've checked the source files for invisible characters that might be 
causing the problem, and can't find any.  Any clues as to what's going 
wrong here, and how to work around it?


Thanks,

--Stuart A. Malone
  Llamagraphics, Inc.