Sudden failure of 32-bit Oracle 11g ODBC driver in 64-Bit Win7 box

I had a working ODBC connection to an Oracle DB using the 32-bit 11g ODBC driver. Suddenly I was unable to connect, getting the error:
Testing Connection
Unable to connect
[Oracle][ODBC][Ora]ORA-00604: error occurred at recursive SQL level 1
ORA-12899: value too large for column "SYSTEM"."LOGON_AUDIT"."PROCESS" (actual: 13, maximum: 12)
ORA-06512: at line 51
For a strange twist, the connection works perfectly with the workstation in Safe Mode. I've tried disabling Symantec Endpoint Protection, and adjusting the Firewall, but so far no dice. Any advice I can get will be appreciated!

How do you get the 32bit client to communicate with the 64bit Oracle instance on the same windows box? After installing the 64 bit db and client (on a developer desktop), I installed the 32 bit client to a different oracle home. I could not get it to connect to the listener - what am I doing wrong? Should I reinstall it to the 64bit home - I'm afraid that'll kill everything though.
Also, I think I'm correct in this, but not sure: any 32bit app must use the 32bit client on the 64bit box. MS Access needs 32bit ODBC, which needs 32bit client, etc.

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