Have you checked your cutting strip for gouges? scratches? Make sure cutter strip is down all the way across.
Make sure nothing in the carriage head track,
You stated it is a new blade,, You have to set the blade depth for it again. And because you left the new blade at the same height and force, check the blade tip and make sure it is not broken off.
This is how you set the blade depth correctly below. Ripping is usually caused by too much blade exposed out of the blade holder.
To start with, you should set your blade depth correctly, by taking the blade holder out of the machine, and firmly cut across a piece of scrap vinyl, you will be cutting. You should only be cutting the vinyl and barely a mark on wax paper backing, Adjust blade to get there, Then put the blade holder back in machine, and use the force of the machine to get there, same results, only cutting the vinyl and barely a mark in wax paper backing.