Conflict when using Private Message 7.x-3.1

Hi,

I'm not sure if this really belongs here, but I thought it might help to highlight this issue here as well as the private module issue queue.

After I enabled the private message module (http://drupal.org/project/privatemsg) I can't post anything into a group on the site without getting the following error:

Warning: array_flip(): Can only flip STRING and INTEGER values! in DrupalDefaultEntityController->load() (line 179 of /home/quickstart/websites/commons3.beta/includes/entity.inc).

Recoverable fatal error: Object of class Message could not be converted to string in DatabaseStatementBase->execute() (line 2168 of /home/quickstart/websites/commons3.beta/includes/database/database.inc).

I printed out what is passed to array_flip() in entity.inc and it looks like the whole node created notification object is getting passed into $ids. I have attached a print out of $ids just before it is passed to array_flip().

I have posted this into the private message issue queue (http://drupal.org/node/1974638) and I'll have a dig into it myself today to see if I can figure out why this is happening.

Cheers

Tom