Last November I bought a 96" X 72" DaLite High Contrast Matte White electric retractable screen (non-tensioned) I was assured by a DaLite rep that at that size tensionsing would not be required. About two months ago I noticed slight warping that has become gradually worse since then. In despair, I phoned DaLite for advice and was informed that on the new High Contrast Matte White (and only that finish) screens apparently there was a chemical problem of some sort that caused screens to warp. The problem has been discovered and resolved on newer HCMW screens. They offered to replace mine at their expense with a new one made properly even though the warping is still minimal! They assured me that this is likely the culprit and that a replacement screen would not do this. That was substantially better than the advice I expected to find! If you have a new DALITE HC matte white check it for warping, particularly in a 'V' shape. If you see this phone them and describe the problem and the date you purchased it. I am very pleased that after six months DaLite is standing by their product 100%.