There is still an issue with the add data entry function If a double return does not register (as is possible when rapidly inputting lots of  data quickly) any simple and move the cursor to the next cell ( ie 2 entries are typed inadvertently into the same cell, Gretl crashes. So, if the user input error occurs during a long series of data all previous inputs are lost. In addition, if the user has not saved any other operation outputs or analysis before the data entry error occurs, all that is lost too.   I would humbly suggest that any data error entry in the Add Data function calls up a data entry error warning rather than crashing Gretl.