[Kiriakos Ntolias]

Actually this also happened to me and seems that it a bug of premiere cc 14.2.
Nesting is not working me but while i was troubleshooting the issue i figured that when i right clicked on the clip and selected the reverse tick box, instantly the time turned into 00:00:00:01 second, i managed to get over it by scrubbing the time back with my mouse until changed value speed is 100% and voila.. the clip was on the timeline and reversed speed.

Have a look for yourself if this helps..