Problem in MultiSite configuration -- vieo appearing on wrong site

We just installed Kaltura module into a Drupal 6.10 multisite configuration. The way that works is that the sister sites use the code and modules from the main site; each sister site has its own file system and separate database. However, you also have to activate specific modules used in each of the sister sites.

So we activated the Kaltura module on the main site and followed the instructions re server and partner activation, etc. We also set permissions.

We then did the same thing on one of the sister sites. We uploaded video to the sister site and it did not appear. We found it a few minutes later on the main site. We then had someone else upload video on the sister site from another location; that upload did not appear on the sister site but appeared in a few minutes on the main site. Both uploads turned up fine on our Kaltura account.

More troublesome was that on the main site the video upload done by someone else was created on the main site with a random user's username, perhaps because the person who had created the video node on the sister site does not have an account on the main site. Hmmm. Not good.

So is this a path issue on our server (We are in a Media Temple Dedicated Virtual server). Is there a mysql issue? And is there a security issue given that a node was created under a random username?

Thoughts? Suggestions? Has anyone run into this? Any thoughts from Kaltura folks?

One more thing: When you edit the video node that was created on the main site, this error appears at the top:

warning: preg_match() expects parameter 2 to be string, array given in /var/www/vhosts/MYSITE'S URL/httpdocs/includes/bootstrap.inc on line 771.

Would love some help. This seems a great module but perhaps it is not equipped to handle multisite configuration.

geoff gevalt