Corel X7 - Clips too short for a transition? What?

[dh4m13l]

Hello people, I'm just starting with video editing, many of you may know how I feel, excited and frustrated at the same time lol
I'm using Corel VideoStudio Pro X7, I've been applying transitions and everything with no problems, but now every time I want to do it I get a message that says "The clips are too short to apply a transition effect." What? First clip is 6 seconds, the following one is 22 seconds, what's wrong? I tried to extend both to even a minute just to check, it still says the same thing! What's going on? I'm going crazy with this, my eyes are alredy swollen, could you please help me out? I'd appreciate it very much really.
Thank you.

Daniel

PS: FIXED!!! There was a little very short clip, one hundredth of a second which was not visible without a lot of zoom, I don't know how I saw it... Gosh!!!! Thanks anyways I thought I could post the "solution" here for reference.