Revit Quick Tip: All materials are Grey

It may happen to you that you start working with phases you notice something strange. If your phase filter is in "Show All" or "Show New" all existing materials are in grey!

To solve this just create a new filter - is not a good idea to change default filters - to be used as New and All showing everything in color.

I know, this is quite a rookie mistake but you probably - as myself - forget about this simple thing from time to time...