Window (and Clarion) Freezes


Clarion 10 / Win 10.
When I open a window to report control data, it freezes.
I insert a FieldlookupButton and choose the field.
Then I open the “Actions” field and click on the button (on the right) to call “When the Control is accepted => Lookup Key”. The window freezes. In the title appears “Not responding”.
Just closing the Clarion to be able to return.
This happens often.
Does anyone have a solution to this problem ?

Thank you.