'k, now I'm confused ... I just brought online a couple of 64bit 
servers, and figured I'd move one of my slaves onto it .. so, I make sure 
that slony 1.1.5 is installed, and since its replacing one of the older 
slaves, I've unconfigured everything and am just going to setup all the 
slaves from scratch ...

But, when I try to set things up, using the same slony_master_setup.sh 
script I originally used when all servers were i386, I'm getting an odd 
error:

<stdin>:16: Database ams subscribed to slaves
<stdin>:26: PGRES_FATAL_ERROR load '$libdir/xxid';  - ERROR:  could not load library "/usr/local/lib/postgresql/xxid.so": dlopen (/usr/local/lib/postgresql/xxid.so) failed: /usr/local/lib/postgresql/xxid.so: unsupported file layout
<stdin>:6: Initializing the cluster
<stdin>:14: Database cluster initialized as Node 1
<stdin>:15: Storing node 2
<stdin>:23: Node 2 created
<stdin>:24: Storing node 3
<stdin>:26: Error: the extension for the xxid data type cannot be loaded in database 'dbname=ams host=mx2.hub.org port=5432 user=pgsql password={'
<stdin>:28: Could not create Node 3!

Now, node three is my new 64bit server ... but, if I load xxid.so 
manually, it appears to load fine:

ams=# load '/usr/local/lib/postgresql/xxid.so';
LOAD
ams=# load '/usr/local/lib/postgresql/slony1_funcs.so';
LOAD
ams=# \q

So, what am I overlooking? :(

thanks ...