Milestone 2_Beta_1 (64 bit) shows menu item icons, while it's not visible in milestone 2_Beta_2. See Symbol toolbar is partially inactive, TeXnicCenter for a short discussion and a display of the two versions.
You seem to have CSS turned off.
Please don't fill out this field.
This works for me. It must be a local issue.
I can think of the following: Try resetting the toolbars (essentially remove all customizations and go to the factory settings). Tools | Customize | Toolbars.
Another way: Try the other user interface language (German, I guess). If you see the icons there, then resetting should help.