Big issues setting up a complete new site with enfold

hey guys,

first of all: we love your theme and use it very successful for over a Year now with several updates (wordpress as well as enfold)
even the last update to wordpress 4 and enfold 3 brought no problems whatsover. everything is perfect.

As we are so happy, we want to setup another site with enfold. we read all threads regarding http-errors and memory limits but the issues are the following:

with a complete fresh install at all-inkl (using there software installation tool to install wp 4) and afterwards immediately uploading enfold we had the following issues:
-> unable to upload pictures (as many already postet) – got HTTP-Error and no more information
-> unable to import demo content (we should reload the page – after doing that again an error that logo, favicon etc. already exists)

calling the all-inkl support several times.
we changed htaccess from:

AddHandler php53-cgi .php
php_value memory_limit 256M
php_value max_input_vars 10000

# BEGIN WordPress

# END WordPress

to

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress
<Files wp-config.php>  
   order allow,deny  
   deny from all  
</Files> 

php_value memory_limit 256M
php_value memory_limit 256M
php_value max_input_vars 10000

resulting that we were able to import demo-content and uploading pictures.
importing photo-demo content we see things on the frontend like this:

Warning: session_start() [function.session-start]: open(/tmp/sess_fb3a4454ee8563c363298c26614bdf30, O_RDWR) failed: Permission denied (13) in /www/htdocs/w00f5619/db/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/masonry_entries.php on line 32

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /www/htdocs/w00f5619/db/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/masonry_entries.php:32) in /www/htdocs/w00f5619/db/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/masonry_entries.php on line 32

before the page starts…..
and

Warning: Unknown: open(/tmp/sess_fb3a4454ee8563c363298c26614bdf30, O_RDWR) failed: Permission denied (13) in Unknown on line 0

and

Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown on line 0

at the end of the site.

we really tried everything and read all the posts and called our hoster all-inkl about 5 times.
Nothing really helps us getting things work completely.

the funny thing: on the other mentioned site everything ist working fine on – as far as we see – the exact same enviroment also at all-inkl.

we don’t know, but somebody or something (enfold or all-inkl) has major problems we would love to be solved!

thanks in advance,

christoph

ps.: if it should be a hoster issue: you sometimes reccomended all-inkl yourself and their support ist really good. they don’t find a solution, telling us, it has to have something to do with the theme. Specially as everything is working fine using a standard theme

pps.: and YES: we not even just deactivated all plugins, we even deleted them, because it was a fresh install we don’t care so much about yet.

pps.: We tried all the routine (fresh install and so on) which always worked fine with all-inkl and enfold for about 5 times. same results.