I made the same experience Terramex described today as I was interested if BlindWrite is the problem after philamber's post. Installed latest trial version of BlindWrite 6 (6.01) using EZ-Play V8 and Patin Couffin 37. When EZ-Play is enabled I couldn't start my Command & Conquer 3 Tiberium Wars -- Kane Edition using SecuROM 7.32.0010 it doesn't matter if I use the hide option or not the game won't start until it's switched off.
So I tried Madden NFL 07 using Safedisc 4.70.000 and I got no problems even when EZ-Play was activated in normal or hide mode. I read that some people couldn't start their games with BlindWrite installed like gregski24 mentioned but I could not reproduce this behavior.