Weird thing is happening

[frybo30]

This weird thing is happening to me: When I open a saved screen
saver, go to Sequencer and click Add Files in order to add an image,
the box that shows up with my files (in this case, my Photos folder),
the bottom of the box with the Add command does not show up. I can
highlight a photo to add, but I can't get to the Add command.
Furthermore, I can't close anything and I have to use Ctrl+Alt+Delete
to close the program. Can someone help me?