Storyline skipping a slide

I'm having the same issue, using Storyline2. I think it came when moving/inserting slides from one scene to other, I have been trying to solve this for several hours with no solution. It skips right over a slide.

I got the properties set to advance by user and advance to next slide. I have tried everything suggested above-imported slides to new presentation, checked properties, etc. The only thing I did not try, was adding a blank slide, because it will impact my slide numbering sequence.

I'm planning to send you the problematic slides for support.  Should i load the .zip file? How long it takes normally to get some feedback?

Thanks.