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Heres a code sample. If you comment out the three lines creating and adding the label the view looks fine. I need to add subviews because I'm trying to create a grid-style table of labels and values.

import ui

class MyTableViewDataSource (object):
    def tableview_number_of_sections(self, tableview):
        # Return the number of sections (defaults to 1)
        return 1

    def tableview_number_of_rows(self, tableview, section):
        # Return the number of rows in the section
        return 3

    def tableview_cell_for_row(self, tableview, section, row):
        # Create and return a cell for the given section/row
        cell = ui.TableViewCell()
        #cell.text_label.text = 'Foo Bar' # uncomment to switch behaviours
        label = ui.Label()      # comment out to switch behaviour
        label.text = 'mylabel'  # comment out to switch behaviour
        cell.add_subview(label) # comment out to switch behaviour
        return cell

data_source = MyTableViewDataSource()
tv = ui.TableView()
tv.data_source = data_source
mv = ui.View()
mv.add_subview(tv)
mv.present()

There isn't really any extra header view, your label frames are just incorrect for some reason and overlap with the next cell (not quite sure why right now)... Try adding something like label.frame = cell.bounds before you add the label to the cell.

That does the trick in the example. I can't use it directly in the real code because I'm putting several labels into the cell, but it should just be a matter of calculating the required frame geometries for the labels. Thanks!

• update. The workaround works fine for my use case. I set the label frame to the cell bounds, then offset .x and .width as required. Looks perfect!