SrKinko

For some reason when i try to edit the speed of a selected video via the Speed effect in videopad it wont load the video again if i try to change the speed it just says "building preview please wait" but no matter how long i wait for it to "built the preview" it never loads anything. I have tried to change the speed of videos numerous times but i always end up with the same result. Could someone plaease help me with this? And if this helps I have version 4.21. Thanks, SrKinko