Drag and Drop problems in MFC

I am trying to enable drag and drop in my MFC application. I am dragging elements from a tree control to a list control and I am processing the following messages:

Everything works fine in debug mode but the release executable crashes as soon as I drag an item. Has anyone come across this issue before?
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AndyAinscowFreelance programmer / ConsultantCommented:
>>>Everything works fine in debug mode but the release executable crashes

Sounds like an error in code - have you iniitialised all variables? (The debug mode build does it automatically, release mode does NOT).
top-gunAuthor Commented:
Thanks for your reply. It turned out to be an issue with message reflection which was causing the release version to crash.

I was using the following to detect dragging:

Changing this to following fixed the issue:

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