I load a small spreadsheet, select one cell and change the font of that one cell. The entire application becomes unresponsive, although I can still resize and move the main window. Clicking in any cell does nothing; the cell is not selected and any previously selected cell remains selected.
If I try to close the application by clicking on the X in upper right corner a dialog box appears that says “Save Document?” but the rest of the dialog box is solid gray for about 20 seconds and then finally the name of the file appears with the Don’t Save, Cancel and Save buttons appearing.