Seeing a blank white page generally indicates that a template could not be generated and saved to disk.
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This is most commonly caused by low disk space, you can check this by running:
df -h
- If this is caused by disk space issues then you will need to clear space on your server
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Temporarily you may be able to force clear the template cache by running the following command. The issue should subside but will return unless the disk space is freed up.
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rm -f /usr/local/mediacp/htdocs/temp/templates_c/*.tpl.php;
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