Since the last release I have noted that the firstname field displays as blank and it looks like you cannot add data into it:

 - When adding a new Lead

 - When editing a Lead or Contact

The field appears to be present though, as I can tab to it, type and some of what I type is saved, but not displayed when editing.

Also when editing a task the status (not started etc) is on top of the calendar when I click on the due date to change it.

I am using Chrome (Version 55.0.2883.87 m)

EDIT:

The screen shots below are taken from Chrome. Note that the Firstname field is not available on Contacts or Leads, but is actually hidden, so data can be added. When teh browser is made narrow it 'pops under' the title drop down and is entirely visible.