I slammed the door and tried again yesterday because it started raining and after slamming the door shut it rolled up. Do you guys still think it's the regulator? I'm going to open up the door panel tomorrow, but I still want thoughts in case I get it open and there isn't any apparent problem.

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2005 ///M3 Competition / Interlagos Blue-Black /6spd/SS Race Exhaust/Angel Eyes/Passport HW/Mich. Super Sports Soles (love em)
2008 ///M3 Melb Red w/ Beige Novillo, Tech, Prem, & 19" (Retired)
2005 X5 4.4i Estoril/Grey Sport, Nav, DSP, Prem, Pano, etc. (Wifey's)
2007 335i Silver/Black SP,PP,CWP, Comfort access, & Sirius (Retired)
2001 X5 3.0i (Retired) Silver/Gray Sport w/19"/Prem/DSP/CWP
2002 YZF600R (Retired)