Just to report that I'm suffering from this bug too. I can replicate the File->New->Spreadsheet and then click on Sheet 2. I also suffer other crashes when working with spreadsheets, which I presume are related. For example, I'm getting intermittent crashes when opening a second spreadsheet. Grave indeed. I'm running Lenny on a MacBook Pro (with the NVIDIA proprietary driver, but I don't think that matters). I'm using version 1:2.4.1-17.