AIToolboxSuite::AddToolbox seems to cause malloc break. (OSX, CS6)

Question

Hi all,
I'm trying to write something that detects when tools are selected and deselected using AIToolboxSuite, but am running into an issue where I get the following error when I call AIToolboxSuite::AddToolbox
Adobe Illustrator(20630,0x7fff73fe1180) malloc: *** error for object 0x8: pointer being freed was not allocated
*** set a breakpoint in malloc_error_break to debug
Here's the code below.  I'm calling this in my plugin's PostStartup method, but the issue seems to happen even if I move this code to another section (e.g. when my plugin is selected)
Usually I notice the following during runtime: AddToolbox is called, I see a bunch of messages (including toolbox messages) start coming in (I have some debug print statements on Plugin::Message)), but before the AddToolbox call is finished, the malloc error occurs. So far I'm stumped as to what could be not allocated on my end.
The error as a screenshot is below - note the tool selected message gets called (I have some basic if statements to filter it / print a message) before the issue occurs:
API Version : Adobe Illustrator CS6 SDK Build 682.6.1.6.1.1.0.0.0.1.1
Illustrator version: 16.0.0
OSX Version: Mountain Lion

Answer 1

in case the code image is hard to read, here it is:
        //Start watching tool selections
            int count;
            ASErr toolMsgInitResult = kNoErr;
            toolMsgInitResult = sAIToolbox->CountToolboxes(&count);
            aisdk::check_ai_error(toolMsgInitResult);
            if(count > 0){
                NSLog(@"grabbing toolbox");
                toolMsgInitResult = sAIToolbox->GetNthToolbox(0, &fToolboxHandle);
                aisdk::check_ai_error(toolMsgInitResult);
                if((fToolboxHandle != NULL) )
                    toolMsgInitResult = sAIToolbox->AddToolbox(fPluginRef, "SDK Annotator", &fToolboxHandle);
                    aisdk::check_ai_error(toolMsgInitResult);
                NSLog(@"grabbed toolbox");
            else {
                NSLog(@"no toolbox yet");