If your timesheet entries aren't showing, be sure you have the correct date selected and then click the button to Show Entries for This Date.
If you have a lot of entires, and the last ones aren't showing or saving, that's because there is a limit of 18 entries. If you have a lot of entries, you may need to consolidate them. One example of this is to combine all travel into one items and make notes as needed in the comments area. This consolidation process can be used for other items, as well, such as office time or anything easily put together under one line.