Is it just me?

Alright, I need some assistance here. Notice how my very last picture in the previous blog is not centered, but instead is left-aligned?

Is blogger just finicky or is there something I can do to fix this?

Usually, when I insert a picture, a little blue box will pop up and have size options, alignment options, and even the option of adding a caption.

However, once I select these options, or if I click on something before selecting them, the box goes away and I can never get it back. I try clicking on the picture, double-clicking, right clicking. Sometimes it will appear for an instant, and then disappear as soon as I release the button or move my cursor.

Sometimes my pictures even move from where my cursor was when I clicked insert picture. Help!