error - NOTICE: current transaction is aborted, queries ignored until end of transaction block

Hello.

I have been having problems with postgresql large objects...i have been
searching the archives of this group and i have posted a question or two but
i have so far be unable to resolve the issues.  right now, i have a screen
that loads a few LOs...they occasionally don't make it to the screen.  i see
a couple of different errors in my log files (which i included below).  i
turned on debugging (d2) and i see the following on many of my queries (see
below).

DEBUG:  StartTransactionCommand
DEBUG:  query: SELECT DISTINCT sbhd.timestamp AS "modifydate",
sbhd.versionid AS "versionid", sbhd.documentdescription AS
"sbhdocumentdescription", sbhd.maxversions AS "maxversions", sbhd.documentid
AS "sbhdocumentid", sbhd.hidden AS "hidden", sbhd.documentpath AS
"sbhdocumentpath", sbhd.parentid AS "parentid", sbhd.ownerid AS "ownerid",
sbhd.documentname AS "sbhdocumentname", sbhd.createtimestamp AS "createdate"
FROM document sbhd  WHERE  sbhd.documentpath =
'/cmarkiew/porsche/porsche_speedster.jpg'
DEBUG:  ProcessQuery
DEBUG:  CommitTransactionCommand
DEBUG:  StartTransactionCommand
DEBUG:  query: SELECT versionid, versionid, versioncomment, versionlabel,
creatorid, documentid, versionorder, datestamp, versioncontent FROM
document_version WHERE versionid = 1034272
NOTICE:  current transaction is aborted, queries ignored until end of
transaction block
DEBUG:  CommitTransactionCommand
DEBUG:  StartTransactionCommand
DEBUG:  query: SELECT versionid, versionid, versioncomment, versionlabel,
creatorid, documentid, versionorder, datestamp, versioncontent FROM
document_version WHERE versionid = 1034272
NOTICE:  current transaction is aborted, queries ignored until end of
transaction block
DEBUG:  CommitTransactionCommand

what causes the "current transaction is aborted, queries ignored until end
of transaction block?"  the first query in the above debug block does not
load an LO, but the second one does.  after the second query, seems like all
subsequent have that message...my log file starts getting a bunch of the
following:

No results were returned by the query.
    at org.postgresql.jdbc2.Statement.executeQuery(Statement.java:63)
    at com.commnav.sbh.framework.persist.JDBCEngine.load(JDBCEngine.java:274)
    at
com.commnav.sbh.framework.persist.PersistenceObject.load(PersistenceObject.j
ava:169)
    at
com.commnav.sbh.framework.documentmanager.SBHDocument.loadComplex(SBHDocumen
t.java:402)
    at
com.commnav.sbh.framework.documentmanager.SBHDocument.getSBHDocument(SBHDocu
ment.java:363)
    at
com.commnav.sbh.servlets.DocumentManager.doPost(DocumentManager.java:201)
    at com.commnav.sbh.servlets.CommnavServlet.doGet(CommnavServlet.java:170)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
    at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
    at org.apache.tomcat.core.Handler.service(Handler.java:286)
    at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
    at
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:79
7)
    at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
    at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpC
onnectionHandler.java:210)
    at
org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
    at
org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
    at java.lang.Thread.run(Thread.java:484)
No results were returned by the query.
    at org.postgresql.jdbc2.Statement.executeQuery(Statement.java:63)
    at com.commnav.sbh.framework.persist.JDBCEngine.load(JDBCEngine.java:274)
    at
com.commnav.sbh.framework.persist.PersistenceObject.load(PersistenceObject.j
ava:169)
    at
com.commnav.sbh.framework.documentmanager.SBHDocument.loadComplex(SBHDocumen
t.java:402)
    at
com.commnav.sbh.framework.documentmanager.SBHDocument.getSBHDocument(SBHDocu
ment.java:363)
    at
com.commnav.sbh.servlets.DocumentManager.doPost(DocumentManager.java:201)
    at com.commnav.sbh.servlets.CommnavServlet.doGet(CommnavServlet.java:170)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
    at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
    at org.apache.tomcat.core.Handler.service(Handler.java:286)
    at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
    at
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:79
7)
    at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
    at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpC
onnectionHandler.java:210)
    at
org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
    at
org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
    at java.lang.Thread.run(Thread.java:484)

what should i look for?  can i get other information from logs (i think i
can raise the log level to 3 if it would help).  i can send pieces of code,
but our data layer is pretty abstracted, so i don't know how much that would
help.

finally, an apology.  i started a thread about this issue a few weeks ago
but got pulled onto some other stuff.  i am determined to follow this until
i fix it this time.

i appreciate your help.
chris