Depuis la 1.7+ j'observe (sous Windows XP + Apache 2 + Mysql 5.0) cette réponse étrange qui survient de temps en temps :
Warning: Unknown(typo3/class.t3lib_div.php): failed to open stream: No such file or directory in Unknown on line 0
Fatal error: (null)(): Failed opening required 'typo3/class.t3lib_div.php' (include_path='.;c:\php4\pear') in Unknown on line 0
Je redémarre Apache et hop, tout redevient normal.
... ?