I recently obtained a Dalite Hi-power screen with the slow roll up option (don't remember the designation, maybe CRS). After viewing it, I noticed some horizontal white lines about every 10 inches in the middle of the screen. At first I thought they were from the projector (L200U) that I just purchased but after trying to adjust them out, realized the lines are in the screen. My guess is that they are caused by the roller or tension mechanism. Has anyone seen this before. The screen is said to have been used one week. I've put it up and rolled it down once. Any thought appreciated.