No, but I wouldn't hestitate to use paper from Proworld. Others here use the paper.
Have you checked the temperature of your press to see that it is running at the correct temp? You didn't mention what setting your using. What time, temp and pressure are you using?
It may not be the paper. A little tweaking can sometimes save the day.

But yes, sometimes an issue with a batch of paper does crop up. Have you contacted Ed to see if others are having issues? That might help, too.