Yesterday while drymounting several posters, I noticed small bubbles that appeared on each piece after being in the press for 5 minutes at approx. 180 degrees. I had to run one poster through three times to get rid of all the blistering, one poster had to endure four passes in the dry mount press. Is there something up with the Speedmount? Anyone else have the same problem? When I shifted the location in the press of the smaller poster, the bubbles disappeared. Could this be uneven pressure from the platen (sounds silly, I know) or a problem with the vacuum? Or is it a problem with the speedmount? Often the corners don't stay put either when I use Speedmount. Does anyone have any input? Thanks in advance..as always.