TM doesn't attach to project - yet shown active in project settings

Dear all,

I'm a first time user of Studio 2015. I think I've basically grasped the concept of TMs, TBs and projects. However, I have the following problem and I'm getting nervous as I need to get a translation done.

I created a MASTER_TM, saved it in a new folder on my D drive (not C where Trados suggests) where all my translation work is stored. I have then, just to practice, aligned an old translation, which went fine. The segments are in this TM.

I then created a project (without the option of a project TM) with several documents which I merged for translation and attached the previously created MASTER_TM. In the project settings (or whatever it's called in English) this TM shows with all its ticks. Yet in the Editor, it says that there's no TM attached.

Just for the sake of it, I created a new TM from within the project and this one works.

What do I need to do for the Editor to recognize my MASTER_TM? Is there a typical beginners' mistake I made?

Thank you very much for your support

Uli

Clueless in Cologne