[fw-db] ZF 1.7 crashes Apache ???

hi,

Vista SP1 + xampp 1.5.4a + ZF 1.7 everything is fine.

switching to the current xampp 1.7, apache consistently crashes as soon as
ZF does an actual mysql query. eg: $stmt = $db->query($select) or
fetchAll().

mysql_query($query) works fine with both xampp versions.

ZF 1.6 & xampp 1.7 also crashes apache.

any ideas?
thanks mike

apache err_log:
[notice] Parent: child process exited with status 3221225477 -- Restarting.

windows error message when apache crashes:

Problemsignatur:
Problemereignisname: APPCRASH
Anwendungsname: apache.exe
Anwendungsversion: 2.2.11.0
Anwendungszeitstempel: 493f5d44
Fehlermodulname: php_pdo_mysql.dll
Fehlermodulversion: 5.2.8.8
Fehlermodulzeitstempel: 493d7650
Ausnahmecode: c0000005
Ausnahmeoffset: 0000250a
Betriebsystemversion: 6.0.6001.2.1.0.256.1
Gebietsschema-ID: 1031

xampp 1.5.4a
+ Apache 2.2.3
+ MySQL 5.0.24a
+ PHP 5.1.6 + PHP 4.4.4 + PEAR

xampp 1.7
+ Apache 2.2.11
+ MySQL 5.1.30 (Community Server)
+ PHP 5.2.8 + PEAR (Support for PHP 4 has been discontinued)

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