I executed this query from SQuirreL:
exec sf.salesforce.getupdated('Lead',

,

)

And the server burped out this:
2011-01-19 10:16:10,805 ERROR [org.teiid.PROCESSOR] (Worker30_QueryProcessorQueue639) Unexpected exception for request cFDOigVAx+GT.9
java.lang.NullPointerException
at org.teiid.translator.salesforce.execution.ProcedureExecutionParentImpl.next(ProcedureExecutionParentImpl.java:37)
at org.teiid.dqp.internal.datamgr.ConnectorWorkItem.handleBatch(ConnectorWorkItem.java:281)
at org.teiid.dqp.internal.datamgr.ConnectorWorkItem.execute(ConnectorWorkItem.java:266)
at org.teiid.dqp.internal.process.DataTierTupleSource.getResults(DataTierTupleSource.java:281)
at org.teiid.dqp.internal.process.DataTierTupleSource.access$000(DataTierTupleSource.java:71)
at org.teiid.dqp.internal.process.DataTierTupleSource$1.call(DataTierTupleSource.java:123)
at org.teiid.dqp.internal.process.DataTierTupleSource$1.call(DataTierTupleSource.java:120)
at org.teiid.dqp.internal.process.DQPCore$FutureWork.run(DQPCore.java:108)
at org.teiid.dqp.internal.process.DQPWorkContext.runInContext(DQPWorkContext.java:188)
at org.teiid.dqp.internal.process.ThreadReuseExecutor$RunnableWrapper.run(ThreadReuseExecutor.java:116)
at org.teiid.dqp.internal.process.ThreadReuseExecutor$3.run(ThreadReuseExecutor.java:290)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
2011-01-19 10:16:10,805 ERROR [org.teiid.CONNECTOR] (Worker29_QueryProcessorQueue640)
java.lang.NullPointerException
at org.teiid.translator.salesforce.execution.ProcedureExecutionParentImpl.close(ProcedureExecutionParentImpl.java:47)
at org.teiid.dqp.internal.datamgr.ConnectorWorkItem.close(ConnectorWorkItem.java:146)
at org.teiid.dqp.internal.process.DataTierTupleSource$5.call(DataTierTupleSource.java:322)
at org.teiid.dqp.internal.process.DataTierTupleSource$5.call(DataTierTupleSource.java:319)
at org.teiid.dqp.internal.process.DQPCore$FutureWork.run(DQPCore.java:108)
at org.teiid.dqp.internal.process.DQPWorkContext.runInContext(DQPWorkContext.java:188)
at org.teiid.dqp.internal.process.ThreadReuseExecutor$RunnableWrapper.run(ThreadReuseExecutor.java:116)
at org.teiid.dqp.internal.process.ThreadReuseExecutor$3.run(ThreadReuseExecutor.java:290)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)

SQuirreL just reported:
Error: org.teiid.core.TeiidException
SQLState: 38000
ErrorCode: 0