I use metallic thread also, without any problem.

Use the correct needle: metalic and a larger size than you would expect.

Also, put the spool in a container/cup in back of your machine so the thread had longer to go before it reaches the tension discs.

As snipforfun wrote superior threads has lots of good information.

You might get some tips from this video: http://www.youtube.com/watch?v=UPgOdI6YDok

Metallic needle and play with the tension even if it looks like it's getting too low.

Some metallic threads just are a real pain. To work with. I have had dreadful luck with Sulky, but Yenmet is outstanding. I have run it in my sitdown quilter, my DSM, and even my high speed multineedle embroidery machine. That is one tough thread! General rule is to check your tension (some metallics need a light tension, some are regular), use either a metallic needle or one size larger than normal, and slow down some. BTW, I have also had good luck with C&C on my DSM, but I just don't like the colors.

Pam

You have to use a good quality of metallic thread. I use Yenmet metallic thread, a metallic needle, drop the tension and my secret is a few drops of Sewer's Aid (found at JAF) to lubricate the thread thru the DSM. I have no problem with doing metallic threads on my Bernina.

I just tried King Star metallic and will never use anything else. Absolutely despise Sulky threads, of all kinds, especially metallic. I have a gallon of silicone and I soak a piece of batting and wrap it around one of the holes threads go thru (multi needle machine) this helps immensely. There are others I use because I have them, but King Star is great.