White page after upgrade about slicomments

[jonnsl]

go to 'Global Configuration' -> 'Server' and set 'Error Reporting' to 'Maximum'.
access the blank page and see if any error message appears.

[szabolcstoth]

On the frontend:

Notice: Use of undefined constant __DIR__ - assumed '__DIR__' in /var/users/scifihu/firefly/web/administrator/components/com_slicomments/libraries/loader.php on line 16
Warning: include(__DIR__/2.5/controller.php) [function.include]: failed to open stream: No such file or directory in /var/users/scifihu/firefly/web/administrator/components/com_slicomments/libraries/loader.php on line 16
Warning: include() [function.include]: Failed opening '__DIR__/2.5/controller.php' for inclusion (include_path='.:/opt/php5.2/lib/php') in /var/users/scifihu/firefly/web/administrator/components/com_slicomments/libraries/loader.php on line 16
Fatal error: Class 'sliController' not found in /var/users/scifihu/firefly/web/components/com_slicomments/controllers/comments.php on line 13

On the administrator page:

Notice: Use of undefined constant __DIR__ - assumed '__DIR__' in /var/users/scifihu/firefly/web/administrator/components/com_slicomments/slicomments.php on line 17
Warning: require_once(__DIR__/libraries/loader.php) [function.require-once]: failed to open stream: No such file or directory in /var/users/scifihu/firefly/web/administrator/components/com_slicomments/slicomments.php on line 17
Fatal error: require_once() [function.require]: Failed opening required '__DIR__/libraries/loader.php' (include_path='.:/opt/php5.2/lib/php') in /var/users/scifihu/firefly/web/administrator/components/com_slicomments/slicomments.php on line 17

I checked, the loader.php can be found here:
administrator/components/com_slicomments/libraries/

The 1.5.1 is the last version, which is working.

[jonnsl]

If possible upgrade your php version to 5.3.x, if this is not possible you can try replace all occurrences of "DIR" with "dirname(FILE)" (without the quotes) in the files administrator/components/com_slicomments/libraries/loader.php and administrator/components/com_slicomments/slicomments.php ,
but I can't guarantee that this extension will work in php 5.2.x