please help, one of my slave sites just display a blank white page for the frontpage. I can however log into the backend please help?

must be a link to the template as when i put the site offline, i do get the offline page but when i put the site online again - it display the blank page again

i am using acesef for my sef and clearing the urls sorted the problem.

When you have a blank page, this is the symptom of a FATAL PHP Error.
Check if you have a "error_log" file that may contain additional info concerning the reason of the blank page.

Another possible reason is that you created a slave site that require the default "joomla template" and you have deleted them or they are not present. In this case, if you don't have the templates, you can not rendering the front-end.
Verify if you have a joomla template selected by default.