blank page when upgrading from 4.5.2 to 5.0.3

[hpham]

I did upgrade. No error appears. But now, all I have are just blank pages with this content in source

 

<img src="index.php?optimize=1" width="1" height="1" />

 

I have enabled debug in configuration.php

 

$display_errors = true;
@error_reporting(6143);

 

Any one has idea to find out the reason please?

 

Thanks.

[Sitepearl]

Have you checked your Apache error log?

[hpham]

There is nothing wrong in Apache error log.