I was a wiz with iMovie 11 - now completely an idiot with 10.0.6 - can't do simple things. help!

I was so proficient with iMovie '11 -- made more than 200 short videos. Now I'm with iMovie 10.0.6 which crashes a lot, and everything is different. I tried to follow the directions above, but when I click on "Window" there is no "Show Adjustments Bar" for me to click on, so I'm lost. Or just having a senior moment?

What I want to do is make all the still photos in a project the same length to start, then make adjustments. I can't figure out how to do that. I can highlight all the stills, but nothing more than that. If I try to adjust one by itself by dragging the two-headed arrow to the left or right, then hit play, when it comes to that photo it stops dead. The audio goes on and on but the picture is frozen. If I try to adjust it back to the original length it was, it still stops dead on the photo. The only way to keep the vertical line moving is to delete the offending photo. That's not good. I'm getting so frustrated I'm deleting perfectly good photos because I can't figure out what else to do.

How could I have been so good with iMovie 11 and now creating total crap? Can anyone help? Why do they change things for no good reason? I used to be able to make copy appear and disappear slowly -- it was very effective -- but can't do that anymore. Spent a whole afternoon at the Fifth Avenue store and nobody there could figure it out either. What gives, Apple?