Listbox does not deselect or become disabled

I have tried various approaches to deselecting items but the only way it seems to work is from outside the listbox commands. The idea is that if certain programs are open then the selection made by the user will be cleared and a message given. The message is given but the listbox never loses the selection nor does it become disabled.

For the listbox click command I have the following:

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Do you want to allow the user to select multiple items from the list? What is the value for the MultiSelect attribute for this listbox? The code looks like it is intended to be Multi but if it is Single that could cause some issues.

This is not causing your problem but delete this line:

Formula:

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If you are not using Option Explicit this is a bug. I strongly recommend to everyone that they declare variables. Doing so prevents a lot of bug and runtime errors.

No it is a single selection. The reason for it being cancelled is that a program is running that will interfere so has to be

I reckon it's a problem with timing. you could try using application.ontime to run the code-either all of it or just the parts to deselect and disable