Missing run stop button both front panel & diagram

Hello,
I have a VI a colleague gave me and one of it's subVI is missing all the buttons.
It is not the usual trick of custom window appearance, there are no buttons even in the diagram, and in properties, I'm not allowed to check the box to display them. (see snapshot attached)
As you can see, in Execute menu, I can't either run or stop (sorry the interface is in French) , but I can go to execution mode, or execute step by step, and the subVI runs normally.
Anyone ever seen such a weird thing ?
For info, I'm using Labview2012 and the VI is from Labview2010 and it's not protected.
Solved!
Go to Solution.
Attachments:
weird VI.JPG ‏82 KB

I am guessing that the priority (VI Properties -> Execution) has been set to subroutine.

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