Description:
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There seems to be a problem reading Memo-fields (ODBC-type LONGCHAR) from an MS-Access database via ODBC... The first attempt is successfull, but if you try to read the same field again from the same result-set you get nothing. 
Reading non-memo-fields multiple times works OK.

Reproduce code:
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$db = odbc_connect('DATABASE','XXXX','XXXX');
$res = odbc_exec($db, "SELECT Body FROM Letters WHERE LetterID = X");

echo "First attempt: ".odbc_result($res, 'Body'); // displays the letter body
echo "Second attempt: ".odbc_result($res,'Body'); // displays nothing


Expected result:
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First attempt: [Letter body]
Second attempt: [Letter body]

Actual result:
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First attempt: [Letter body]
Second attempt: