Xenserver 5.0 ISO library broken

On fresh systems the CIFS ISO library will be broken somehow (i don't know if this applies to all machines, but all machine i know of...). You can mount your CIFS store but if you try to map a image to a VM it will just do nothing or issues a loopback error ("Internal error: all loop devies are busy").

The only workaround if've got so far is to install the old 4.1 version add the ISO library and upgrade it to 5.0, then it will work as intended.

I'm in contact with the support team and will update you as soon as possible.