Heres a funny thing

[brummie]

My current project
I glued two pieces 20mm plywood together and started to out the pattern which were mostly straight lines as you can imagine I used a few blades I put in a new blade and proceeded to cut I put a left on bias to find to I had to put a right hand bias, put a new blade in and we were back to normal any answers   

[BilltheDiver]

No offense, but could you have put a blade in upside down?  Did the wood jump up off the table more than normal?  It has happened to most of us at some time.

[pierre62]

For my part when a cut 2 or more i take grec tape gluing both sides and stack very well and i use reverse blade #3.