Can't display Dataframes with Multi index

Hello, I’ve encountered an issue regarding dataframes with multi-index. Whenever I create such dataframe, or generate it with a groupby / pivot_table expression etc, there is no output. The cell behaves like the expression created a None object, but trying to print the expression would show the dataframe correctly, in a string format of course. This proves that the syntax is valid, so it’s clearly a bug. Did someone else noticed it?