We just finished the update of 13-04-2022.
(wrongly already included in Update Notes 23-03-2022)
Nmbrs does not support multiple tabs with Nmbrs open at the same time. This may create data damage, like assignment of data to the wrong employees or companies. To make that clearer, we now show a warning stating that if you really need to use 2 windows you could use different 2 browsers instead. That option still allows 2 windows, while the data is saved correctly anyway.