I don't think that will be necessary at this time. I may have found the issue.
In 1.0.3, in lib/error.php a change was made in line 96 from:
$log = new ALog('system/logs/error.txt');
to
$log = new ALog(DIR_SYSTEM.'logs/error.txt');
lib/error.php is included into init.php at line 52.
DIR_SYSTEM is defined in init.php at line 275 or so.
So, this would seem to be a valid error, that should be expected on at least some PHP installations in the absence of some undocumented configuration settings..
David