I’ve been having a similar problem. I have PHP Version 5.2.9. The following is the error I’m getting. I’m using imagsizer. Although the image seems to be resized and where it’s suppose to be. This is part of a safeCracker page. So it may have to do with the safeCracker upload image field?
A PHP Error was encountered
Severity: Notice
Message: getimagesize() [function.getimagesize]: Read error!
Filename: imgsizer/pi.imgsizer.php
Line Number: 153
A PHP Error was encountered
Severity: Warning
Message: Cannot modify header information - headers already sent by (output started at /home/p26h9tjb/public_html/trio_admin/codeigniter/system/core/Exceptions.php:170)
Filename: core/Common.php
Line Number: 405