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Crash on display configuration change (in NSOpenGLView subclass)

I have an NSOpenGLView subclass, and display configuration changes such as attaching or removing a second display are causing strange crashes. I've followed the information in various technotes, notably I am calling update as follows:

- (void)update
{
  [self lockGLContext];
  [[self openGLContext] update];
  [self unlockGLContext];
}

- (void) lockGLContext
{
CGLContextObj cglCtx = (CGLContextObj) [[self openGLContext] CGLContextObj];
CGLLockContext(cglCtx);
}

- (void) unlockGLContext
{
CGLContextObj cglCtx = (CGLContextObj) [[self openGLContext] CGLContextObj];
CGLUnlockContext(cglCtx);
}

This is necessary because (and I suspect this may be relevant to the crash) all my OpenGL drawing is done from a dedicated thread, separate from the main thread.

The actual crash occurs some time after update has completed; the nature of the crash invariably suggests memory corruption deep inside the application or libraries.

So, is there anything intrinsically wrong with the above code, or something else I might be doing wrong in this scenario?

Thanks,
James
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