After the installation of Forum/Mods/Portal you just see a blank page.
This error is usually caused by bad edits of a php-file.
Open the file and go the very beginning (line 1).
The file must start with
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<?php
The very end of the file (last line) must be
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?>
If you find blank space(s) and/or a blank line(s) there, just delete them.
Now save the file und upload it.
After that go and clear the phpBB3-cache.
Now the file should be displayed properly.
Quicklink:
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[url=http://www.board3.de/knowledge/kb_show.php?id=3]Knowledge Base: How to ... get rid of blank pages in forum/portal[/url]