Cocoa Bindings don't update UI when Model changes?

Has anyone found a solution to this problem? I read all the Troubleshooting info at Apple and just about wore out the KVC/KVO and Cocoa Bindings documentation.
I've got one TableView that updates fine, and two others that don't when the Model is modified.
The Model: class VoterController, the variable is an NSMutableArray "playerArray" that contains 7 NSMutableDictionaries, read in from an XML plist. I set the @property and the @synthesize for it. You can't bind a Model, so no bindings for the array.
The View: an NSTableView with one column. The column is bound to the voterController listed below.
Column Binding:
Bind To: voterController
Controller Key: arrangedObjects
Model Key Path: playerName (a key in each dictionary)
The Controller: an NSTableViewController, class NSTableViewController.
Bindings for this controller:
Bind To: mainController
Model Key Path: playerArray (the NSMutableArray)
Controller "mainController":
A simple NSObject (not an Object Controller despite the name) that has its class set as "VoterController", which is the class of the Model object (the array of dictionaries).
Now the thing that has me stumped is that this NSTableView reads the Model data fine but does not respond to changes in it. In other words, if I delete one of the array elements, it does not show up in the View until I re-launch the app and it reads the changed XML from disk.
Even more strange, I have another tableView that DOES dynamically change as I change values for any of the keys in the dictionaries that are the elements of the array. This working tableView has the bindings for each of its 5 columns as follows:
Bind To:voterController
Controller Key: arrangedObjects
Model Key Path: playerName, voteCount, role, etc. for each column. Each of these is a key in the dictionaries. If I change programmatically any of the values of these keys, they are immediately changed in the View.
Apple says the most common reason for Views not updating is non-KVO compliance in the model property. I have the array @property and @synthesize compiler directives, and one View updates and another does not, on the same controller.
I dunno - I don't expect a solution but any tips I will rush off and try. Thanks in advance.

"Is this because VIs which use ConfigData_v1.ctl were not loaded into memory at the time when I made the change to the typedef?"
In short: Yes. Only the callers in memory are updated.
=====================================================
Fading out. " ... J. Arthur Rank on gong."

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