Flipped seams allowances
 

How do you avoid getting flipped or scrunched seam allowances when sewing rows of blocks together. If you do get "flippies" how do you fix them or do you just let them be.? I've tried pinning, not pinning, glueing, basting, clips, starch, spraying, begging, and swearing, but always seem to get at least one flipped seam.

Me too and I have to admit that I leave them for the most part. The key is to check each seam right after sewing it. Adjusting a single flip is easier on a smaller scale. I generally don't check until it is far gone. Sigh!

Donna Poster has a YouTube video on sewing tips. She puts a piece of clear tape over the joint in the machine bed right in front of the needle. Seems to work for her.
https://m.youtube.com/watch?v=--vIltDWpl0
It's about 3 minutes in, but the whole video is worth watching for all the tips.

Honestly, I just leave them be. For the most part they don't cause an issue. If they did, I'd probably argue with myself to just clip them or rip things apart and fix. So far, haven't had that argument.

it happens, sometimes no matter how diligent you may be. I clip it near the seam crossing and press.

Twisted seams bug me. If I can, I fix them, especially, if it is dark under a light.

I don't worry about them. I try but, it still happens.

I've taken many many classes from great award winning quilters. They all say don't clip the seam, just twist them by pressing or take out the thread and resew if it bothers you.

Like onebyone says, I would rather take out about 3/8" of seam and resew. Before I ever stitched two squares together, I had watched hours and hours of Saturday morning sewing and quilting shows and adopted the habit of using a small BBQ squewer to guide the fabric. Martha Pullen used one for every seam she sewed, saying that if the needle hit the wood it was safer than hitting a metal helper.