It's not really an answer, but the same thing happened to me and I performed a "Time Stretch" on a video clip above it and it somehow became unlocked again. Maybe it could work for you!
Premiere is more of the timeline to put clips in. Adobe After Affects is more suited toward editing
One can download the Adobe Premiere Elements 4 at the popular and safe Cnetdownload website. One can also visit the Adobe's official website to download this software.
If one wishes to purchase Adobe's Premiere Elements it is widely available. This software can be purchased at Staples, Best Buy, Amazon, eBay and Dell Canada.
To adjust the playback speed in Adobe Premiere Pro, you can right-click on the clip in the timeline, select "Speed/Duration," and then adjust the speed percentage to make it faster or slower.
To align text in Adobe Premiere Pro, select the text layer in the timeline, then go to the Essential Graphics panel and use the alignment tools to adjust the text's position and alignment.
Adobe Premiere Elements is a software by Adobe Creative Suites. Videos can be edited with preprogrammed features. Frames can be edited with audio manipulation as well. This program is used by inexperienced as well as professional Video editors.
To link audio and video in Adobe Premiere, simply drag and drop the audio file onto the video clip in the timeline. This will automatically link the two together, allowing you to edit them as a single unit.
To merge videos in Adobe Premiere Pro, import the videos into the project, drag them onto the timeline in the order you want them to appear, and adjust the timing as needed. Export the final video once you are satisfied with the editing.
To zoom in on a clip in Adobe Premiere, select the clip in the timeline, go to the Effects Control panel, and adjust the Scale property to zoom in.
I don't know about Adobe Premiere, but it won't work with Windows Movie Maker in any case.
To zoom in Adobe Premiere to enhance video details, select the clip on the timeline, go to the Effects Control panel, and adjust the Scale property. This will increase the size of the video, allowing you to focus on specific details.
I think he uses Adobe Premiere Elements or something.