What do you mean by "an open text box"?
Can you post a screen capture to this forum so we can see what you're seeing?
Screen capture showing box arrowed with small + in corner of box. Box appears when clicking and holding mouse down and expands to any shape when dragging mouse. I found the Pachelbel music also in Audio tracks 10 and 11 (not shown in screen capture) which I am able to edit but can no longer edit the soundtrack..
Ensure that you have all of the Windows and Microsoft updates (including the non-critical updates that don't install automatically).
Download the latest version of Quicktime from Apple.
Go to the ATI or nVidia web sites and ensure you have the latest drivers for your graphics card.
I have done all the updates as suggested, but this did not fix my problem.
Try starting the program while holding down the Ctrl+Alt+Shift keys on the left side of your keyboard. (Hold them down throughout the program's launch.) This can clear some corruptions in the preference file.
If that doesn't work, I think you're going to need to contact Adobe Tech Support and do some troubleshooting.
I tried starting the program as you suggested but this did not help. I tried contacting Tech Support by telephone but the message indicated that they now only offer support for Premiere Elements 12.
I started to take a first hand look at this yesterday, and my initial results did not confirm what you are seeing.
I need to do more work on this in the morning.
But, I need to ask "If you open a new project, do you run into the same issue with this special Instant Movie Theme?
No. If I open a new project and create an Outdoor Wedding Instant Movie. I can edit the soundtrack without problem, as I could initially with my problem project.