Error messages are wonderful things aren't they? If you notice other quirky/unexplained behavior with the machine, it could be a RAM problem. You say you have 2 ODBC connections and 2 Access databases. Are they located on the same machine or across a LAN? One hunch is that the problem is that because of network traffic, complex queries, proxy access. Some kind of delay however slight could be causing the ODBC software to fail. The RAM does seem suspect and some other process on your machine could be set to aggressively take RAM space. I would look into the way Zodbc handles network latency and error conditions between 2 or more ODBC databases. I wonder from what I just suggested would it be possible to get this error from Zodbc? python.exe

The instruction at "0x1b271a1f" referenced memory at "0x00000000" The memory could not be "read"

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