Not on calls, but mine will sometimes tell me that the first song I choose can't be played (first song on an album, or one I choose specifically). I just hit rewind and it plays perfectly, which I find weird.
It already holds 2 bookshelf speakers, a heavier-than-usual-receiver, a Nintendo, an N64, 2x 22" monitors, a laptop, a Model M, and my arms like a champ.When I had sawhorses as the legs, I could stand in the middle of the door and it wouldn't even sag. The legs I feel like are the weight-limiting element of my desk.
If I had an L shaped desk, and wanted to use Ullriks, I'd be tempted to affix the surfaces together with a couple tie plates, place the Ullriks at the two ends, and put a leg or two in the back corner:
Maybe this picture will give you a better idea of what's going on down there.It's inside of a little cabinet / table leg thing from Ikea. The Ullrik I believe. Awesome little box, those Ullriks. I have my computer resting front-faced, in the left cabinet thing and my subwoofer is nestled in a rotated backwards-facing cabinet on the right, so that the subwoofer fires at the wall and not out into empty space (I'm certain I read that that was better one day in the OCN audio...