I only twist seams when the only other choice is to have both seam allowances going in the same direction. I prefer the bump in the middle of the seam line, to having it at the top. I haven't tried clipping.

Clipping will weaken the seam and more then likely the seam will pull apart at the clip with use.

Many of my tops have had twisted seams. It has never created a problem for me, nor has it been visible in the finished quilt. I do all of my own quilting, however, either on my domestic or my midarm frame setup. It has not been a problem at all on my frame setup, but maybe it is a concern if you send the top out to a professional longarmer. I would think their setups would be better than mine, but maybe they are more sensitive.

It may depend also on whether the quilt will be a "show" quilt or a family quilt. I make only family quilts. Perhaps having twisted seams in a "show" type quilt will make a difference, especially if it is getting a custom quilting job with fine details.

I twist the seams all the time, as long as the material isn't a very see-through light or white, where it would be highly visible. If it's a very thin material, then I have been known to iron the whole seam the other direction just to get them to nest.

I was worried when I first turned them but found out that when I put them on the longarm, the loft of the batting (I use Warm & Natural) and the backing seemed to just even them out. I can't even tell after they come off the long arm where I twisted them. I am a beginner using Pantographs and usually quilt a more open pattern. It you wanted a dense quilting pattern on the quilt, then I might would think twice about twisting them.

I have twisted seams if needed so they would nestle and make as perfect a seam match as possible...it is better to do that than have that big hunk of fabric all on one side! And no matter how careful I am when I begin a project with ironing one way, then the opposite, there always come a time in the construction when boom! there they are..all facing the same way! So I do like jenny did...no prob......I am a longarmer and my APQS just sails thru those seams....these machines are heavy duty and a little twist doesn't even make it blink! Even if someone sews a seam with all seam allowances to same side...she just digs in and keeps going..........as far as clipping.....I have never done that and wonder if cutting into seam allowance might weaken that area and cause shredding.....???

There's just not enough time in life to worry about twisted seams. Let them twist! I've never had a problem longarming through them (in fact I don't even notice them once the quilt is on the frame) and I've never noticed them after the quilt is finished.

I don't mean to but I usually end up with a few twisted seams. I just iron them down as flat as possible.

I just iron them flat, too. Never had a problem but I hand quilt.

I usually just repress the block and make the seams go the other way. I alternate direction when pressing blocks, going one way on one block and the other on the second block etc.

I do notice more and more that designers are not telling me in quilt patterns which direction the seam should be pressed so the seams will nest perfectly. I have had to deal with the choice of either a nest seam with a twist or a piled up seams in the same direction. I make sure that the twisted seam is steam press flat and have never had a problem.