Changing speed of clip worked but now doesn't

I have about 5 clips in my timeline. At the start the 2nd clip would not change the speed. I would change the 1.00 to a 5.00 and hit enter and it would do nothing. Then I tried the rest of the clips and they worked fine in changing to the speeds I wanted. I then saved the project and closed it. Reopened it the next day and now NONE of the clips allow me to change the speed at all. There is no error message nothing changes.