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Class icons change after reloading project

I have a strange problem. I have a project with some classes. These classes have a (simple) custom icon, that is working well. However, sometimes, when I reload the project, the class icon changes to this:

Basjong53_0-1598518095781.png

Even weirder, when I click on 'Edit Icon...' to revert to my custom icon, the custom icon is still there!

 

Basjong53_1-1598518178906.png

 

When I create a new VI in the class with the weird icon, the VI will have this icon as the default overlay, not my own icon.

I have to manually click 'Edit icon...' for each class, press OK and apply to each VI every time, really annoying. 

Does anyone know what is happening here?

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Obviously, that is not normal.

 

First think to establish is to find out if it's something wrong in the classes or (just) in LabVIEW IDE. Of course if the classes are corrupted, this could have been caused by the IDE.

 

Are you using SCC? Could it be that the SCC merges the XML files of the classes. That could corrupt the class files so the routine that uses the icons can't display them, while the icon editor can.

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