Problem: The "Blocked" column (gesperrt) is used to show if a segment is editable or not.
In the Ext4 Version this was visualized by a checked or unchecked checkbox in the column.
The column is hidden by default, so the problem is not obviously.
Currently the column is empty, perhaps just the CSS for the checkboxes are missing / is wrong.
Another Problem is, that the filter is just inverted as expected.