Upgrade to pro turned videos black – Video Speed Editor - Slow and Fast motion effects for multiple parts of your videos Review

All of the video edits I try turn black, and this only happened *after* upgrading to the pro version that was advertised for .99 cents but charged me $1.99. Way too buggy. Please fix this or refund.
Review by Gretchen Jean on Video Speed Editor - Slow and Fast motion effects for multiple parts of your videos.