"Cannot Use that Class" message????

[gadzi_h]

The only time a set won't be equipped is when you are missing the primary weapon, which should be obvious is not a bug.

Come to think of it it was the primary weapon. I did get a warning for having a hat of the wrong color equip on a crafter but everything did equip. Even something like a number in the lower right section of the items icon indicating set number would be a huge advantage. At least that way you would know that item did belong to a given set.