We have seen delayt in opening eventviewer when a writable is attached but it has never been that long, mostly just 20 to 30 seconds.
What version of the writable are you using? My guess is UIA + profile or profile only, Am I correct to assume that?
I see it without writable as well, though I'm a few versions back, I believe its been a problem on and off for awhile.
I'm using UIA only for the writable template.