An oddity. I have a program with a couple of tabs, and on the first tab I have various dbforms, some of which were in dbgroups to allow them to be blocked from certain users. Worked okay but the borders are fugly so I changed them to dbcontainers.
In Studio all looks looks good:

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when it runs, however, the top dbcontainer loses its location and moves to the top of the tabpage.

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The second dbcontainer sticks in the right place.

Code:
    Object dbTabDialog1 is a cMydbTabDialog
        Set Size to 212 323
        Set Location to 30 7
        Set Rotate_Mode to RM_Rotate
        
        Object TP_Codes is a cMydbTabPage
            Set Label to "Codes and Description" 
            Object Invmast_Description is a cMyDbForm
                Entry_Item Invmast.Description
                Set Label to "Description"
                Set Size to 12 191
                Set Location to 5 63
                Set label_TextColor  to clRed
            End_Object


            Object Invmast_Desc1 is a cMyDbForm
                Entry_Item Invmast.Desc1
                Set Label to "Desc1"
                Set Size to 12 191
                Set Location to 21 63
            End_Object            
            
            Object Group1 is a Dbcontainer //Group
                Set Size to 120 322
                Set Location to 36 0
                Set Border_Style to border_none
                
                
                Object Invmast_Vendor_Cd is a cMyDbForm
                    Entry_Item Invmast.Vendor_cd
                    Set Label to "Brand"
                    Set Size to 12 60
                    Set Location to 4 63
                    Set psToolTip to "KFP Brand Code"
                    Set label_TextColor  to clRed
                End_Object
                
                 Object Invmast_Alt_Part is a cMyDbForm    
                    Entry_Item Invmast.Alt_part
                    Set Label to "VenRef"
                    Set Size to 12 150
                    Set Location to 4 15
                    Set label_TextColor  to clRed    
                    Set Exit_msg  to (refFunc(Item_New_Value))
                End_Object                
 
                 Object Invmast_Line is a cMyPRLinesADbForm
                    Entry_Item Invmast.Line
                    Set Location to 20 63
                    Set label_TextColor  to clRed
                End_Object
    
                Object Invmast_Group is a cMyDbForm
                    Entry_Item Invmast.Group
                    Set Label to "Group"
                    Set Size to 12 32
                    Set Location to 20 162
                    Set psToolTip to "Main Group Code"
                    Set label_TextColor  to clRed
                    Set PsToolTip to "Group code #1 - mandatory and validated against KFP list"
                End_Object

//... etc    


                Object Invmast_Price_On_Order is a cMyDbForm
                    Entry_Item Invmast.Price_on_order
                    Set Label to "Kirk Price"
                    Set Size to 12 66
                    Set Location to 71 63
                    Set Label_TextColor to clred                    
                End_Object
               
            End_Object //group1

//other always-open dbforms
            Object Group2 is a Dbcontainer3d  //Group
                Set Size to 50 322
                Set Location to 140 0
                Set Border_Style to border_none
              
                Object Invmast_Metal_Typ is a cMyDbForm
//etc
Do dbcontainers need some special juice to make them anchor properly?