Hesk don't run after instllation

[jps]

Script URL: http://hesk.bakkeskoven.dk/
Version of script:
Hosting company: simply.com
URL of phpinfo.php: http://hesk.bakkeskoven.dk/phpinfo.php
URL of session_test.php: http://hesk.bakkeskoven.dk/
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When running HESK after installation or uodate it looks fine and runs the admin page.
But when creating a ticket, the sceen blanks and notihing happens.
When accesing the url afterwards HESK dosn't runs right.

[Klemen]

Do you get any messages if you turn Debug mode ON (Admin > Settings > Help desk) then try again?

Do you have any error messages is sever error logs?

Does it work if you use original English language file?