objects not displayed

printpreview and printing forms works well with servoy v2.2.5. when i open my solution with servoy v3, objects like colums and calculation fields are not displayed in the ‘titel header’ and ‘trailing grand summary’ in the printpreview and on printed out. i took care about the arrangement of the objects on the form. it is strange that the labels are displayed but not the dataproviders. if i try a second or third time to show a printpreview or to print out, the lost objects came back.
is there a trick or is it a bug?

regards