Things work swimmingly when I’m logged in with my Super Admin user.  But member groups who should by all rights have access to the channel entries Safecracker manages I get the following errors:

A PHP Error was encountered
Severity: Notice
Message: Undefined variable: assigned_channels
Filename: cp/content_publish.php
Line Number: 2122

A PHP Error was encountered
Severity: Warning
Message: in_array() [function.in-array]: Wrong datatype for second argument
Filename: cp/content_publish.php
Line Number: 2122

I’m using EE 2.1.3 and Safecracker 1.0.2 on a LAMP stack with Dreamhost.  I’ve checked the permissions for the Member Group and they should be able to create and edit entries in this channel.  If I give the user Super-Admin privileges, then everything works, but that’s not really an ideal solution.

Any assistance would be greatly appreciated.

Does this happen when you view the form or submit the form?

It happens when someone from the member group edits an existing entry that was submitted via Safecracker.

Wait, do you mean in the control panel?

Looks like this is an EE bug: http://expressionengine.com/bug_tracker/bug/15011/

That did it, thanks!  For anyone else experiencing this, I found the fix here