Massive temp files - How to track the root cause?

Hi,
On our system we have about 9-10 subject areas, each being developed by different groups. We began noticing that our temp files found in /u10/app/FNEDW3/apfnedw3/OBIEE/BIDATA/tmp are around 5gb, and filling up very quickly. At one point the entire disk became full because of this and caused some of our reports and dashboards to become corrupted.
Our guess so far is that it's either some kind of incorrect join or a bug in OBIEE that's causing this, so is there any way to track what could be causing it? Our SAs tried rebuilding and restoring the server to correct the problem but it appeared again.
We are on OBIEE 10.1.3.3.3, DB 10g, and
RHEL 4:
Linux 2.6.9-55.0.2.6.2.ELhugemem #1 SMP Thu Jul 5 14:19:45 PDT 2007 i686 i686 i386 GNU/Linux
Enterprise Linux Enterprise Linux AS release 4 (October Update 5)
Thanks,
Kevin

I checked Manage iBot Sessions, nothing there.
Checked the timestamp on the largest temp file currently in the directory (5.4gb), and looked through NQSQuery.log and NQServer.log. Unfortunately the NQSQuery.log doesn't go back that far (1 day ago), I will have to check with the SA to see where the old log files go.
In the NQServer.log file I found the following that occurred near the time the tmp file was last modified:
2008-07-22 11:32:40
[nQSError: 13011] Query for Initialization Block 'Find Manager TIER3' has failed.
[nQSError: 13012] NULL values are not allowed in row-wise initialization blocks.
2008-07-22 11:32:40
[nQSError: 13011] Query for Initialization Block 'Find Manager HQ' has failed.
[nQSError: 13012] NULL values are not allowed in row-wise initialization blocks.
2008-07-22 11:32:40
[nQSError: 13011] Query for Initialization Block 'description' has failed.
[nQSError: 23006] The session variable, NQ_SESSION.MGR, has no value definition.
2008-07-22 11:32:40
[nQSError: 13011] Query for Initialization Block 'GET_MGR_DET' has failed.
[nQSError: 23006] The session variable, NQ_SESSION.MGHQ, has no value definition.
Any suggestions?
Thanks

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