omv-engined Failed loading opcache.so & OMV overrides Apache?

Hi,
I've managed to install OpenMediaVault 0.6 @ Debian Wheezy, but I ran into two issues:

When I try to login, I get this:

Your forum search told me that the omv-engined hasn't been loaded, so I tried

Zitat

root@debian:/# omv-engined
Failed loading opcache.so: opcache.so: cannot open shared object file: No such file or directory
PHP Fatal error: Call to undefined function setproctitle() in /usr/sbin/omv-engined on line 296

A reinstall gives me the following message:

Zitat

monit: Cannot connect to the monit daemon. Did you start it with http support?
Restarting OpenMediaVault engine daemon: Failed loading opcache.so: opcache.so: cannot open shared object file: No such file or directory
PHP Fatal error: Call to undefined function setproctitle() in /usr/sbin/omv-engined on line 296
invoke-rc.d: initscript openmediavault-engined, action "restart" failed.
dpkg: error processing openmediavault (--configure):
subprocess installed post-installation script returned error exit status 255

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But this error returns exactly 0 results on Google.

My second concern is about OVM using nginx - is there any way (apart from using Reverse Proxies) to run a webserver on the side or rather move OMV to a subdir?
The machine I'd like to install OVM on used to be a webserver for, well, websites & cloud-software, but I recently migrated to a new machine. But I've still one website hosted on the old server (where I'd like to install OVM), even tho it's purely a landingpage. When I try to access this site's URL now I wind up at OVM's login-screen.

Thanks!