I've already reported this bug before a few builds.

When you build your own toolbars you can just put text into the toolbars. When you want to use the icons for the tool you have to assign and replace them manually one by one. Which is nearly impossible for a normal user. He doesn't know the original icon that is meant for the tool.

I'm a lucky one. I have MMF 1.5. And can have a look there which tool corresponds to what icon. But it is very cumbersome.

EDIT, correction, it is nasty :/