TYPO3 Core

Just upgraded from 3.8.0 to 4.0rc1 - backend works flawless.
Frontend does not show up and crashes Apache (see detailed info below).
"[notice] child pid 4810 exit signal Illegal instruction (4)"
No PHP-errors are logged.

I tracked down the error to /tslib/class.tslib_fe.php:2588
case 'FUNC':
$incContent = $INTiS_cObj->USER;

Perhapts it's an issue with the new symlinking-process - just in case, my root-directory-structure is attached. I tried both symlinking /tslib into /srv/www/htdocs/web3/typo3/typo3/sysext/cms/tslib, duplicating it into the root-folder, and completely removing it from root - nothing worked out.

thanks in advance!

Mac OS X 10.4
Apache 2.0.52
PHP 5.0.4

drwxrwxr-x 8 ingo www 272 Aug 2 2004 data
drwxrwxrwx 8 ingo www 272 Mar 11 12:17 fileadmin
lrwxr-xr-x 1 ingo www 18 Mar 11 14:57 index.php > tslib/index_ts.php
lrwxr-xr-x 1 ingo www 11 Mar 11 14:58 media -> tslib/media
drwxrwxr-x 22 ingo www 748 May 13 2004 misc
-rw-rw-r- 1 ingo www 5553 Aug 24 2004 senden.php
lrwxr-xr-x 1 ingo www 17 Dec 15 12:30 showpic.php -> tslib/showpic.php
lrwxr-xr-x 1 ingo www 33 Mar 10 18:33 t3lib -> /srv/www/htdocs/web3/typo3/t3lib/
lrwxr-xr-x 1 ingo www 50 Mar 11 15:01 tslib -> /srv/www/htdocs/web3/typo3/typo3/sysext/cms/tslib/
lrwxr-xr-x 1 ingo www 33 Mar 10 18:34 typo3 -> /srv/www/htdocs/web3/typo3/typo3/
drwxrwxrwx 14 ingo www 476 Mar 11 14:24 typo3conf
drwxrwxrwx 12 ingo www 408 Mar 11 12:17 typo3temp
drwxrwxrwx 26 ingo www 884 Mar 11 12:17 uploads
(issue imported from #M2831)