Migrating from 3.1 to 3.7 - write through for a custom cache store issues

We're migrating from 3.1 to 3.7. So far the migration and testing has been fairly uneventful, but there is one issue that came up yesterday that seems like it is going to be tricky to debug.
We have a set of storage-enabled nodes that use a custom CacheStore to read from and write behind to a mongo database. On another node connected to that caching service, read throughs work just fine. (I can set breakpoints on the CacheStore load method and see the load calls coming through just fine) - but what's not working is when the other node does a Cache.put - the Store method on the CacheStore is never called and so far I don't see anything in the logs indicating there is a problem on either side (I'm going to make sure that the coherence logging is up to the highest level on both the nodes today when I'm doing more testing)
I can see the cache put start to dive into the coherence jar, but I don't have source jars for coherence so it's fairly opague what might be going wrong after the Cache.put(object, object) call. I can see that it dives into various coherence methods, but
Any ideas on where to start debugging this?
This setup worked fine on 3.1, and as best we can tell all the API calls were converted over to their proper coherence 3.7 versions, and the coherence.xml files were migrated to use the new xsd etc.

it seems that the issue might be related to this:
2012-08-15 14:19:34.086 Tangosol Coherence 3.7.1.5 <Error> (thread=WriteBehindThread:CacheStoreWrapper(com.foo.cache.MongoCacheStore):Foo.com-CMS, member=13): Failed to store key="assetId=DEFAULT;assetStyle=DEFAULT;initial=c;siteId=foosite;"
2012-08-15 14:19:34.087 Tangosol Coherence 3.7.1.5 <Error> (thread=WriteBehindThread:CacheStoreWrapper(com.foo.configrepo.cache.MongoCacheStore):Foo.com-CMS, member=13): (Wrapped) java.io.StreamCorruptedException: invalid type: 13
     at com.tangosol.util.ExternalizableHelper.fromBinary(ExternalizableHelper.java:266)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$ConverterFromBinary.convert(PartitionedCache.CDB:4)
     at com.tangosol.net.cache.BackingMapBinaryEntry.getValue(BackingMapBinaryEntry.java:124)
     at com.tangosol.net.cache.ReadWriteBackingMap$CacheStoreWrapper.storeInternal(ReadWriteBackingMap.java:5731)
     at com.tangosol.net.cache.ReadWriteBackingMap$StoreWrapper.store(ReadWriteBackingMap.java:4814)
     at com.tangosol.net.cache.ReadWriteBackingMap$WriteThread.run(ReadWriteBackingMap.java:4217)
     at com.tangosol.util.Daemon$DaemonWorker.run(Daemon.java:803)
     at java.lang.Thread.run(Thread.java:662)
Caused by: java.io.StreamCorruptedException: invalid type: 13
     at com.tangosol.util.ExternalizableHelper.readObjectInternal(ExternalizableHelper.java:2303)
     at com.tangosol.util.ExternalizableHelper.deserializeInternal(ExternalizableHelper.java:2746)
     at com.tangosol.util.ExternalizableHelper.fromBinary(ExternalizableHelper.java:262)
     ... 7 moreLooks like it is an issue with the serialization? We're primarily using XmlBean, not POF for serialization.
Any tips on troubleshooting this?
Edited by: RyanGardner on Aug 15, 2012 7:37 AM
Edited by: RyanGardner on Aug 15, 2012 7:38 AM

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