Hello Don.
I found the problem!
Here: http://www.diademblogs.com/tag/crystal-report-with-plesk
First thing i've tried is to change the AppPool user (IWPD_66_domain.com) and set SYSTEM account. After that, the App Works!!
At this point, what would be the best way to configure this scenario?
Maybe come to the origininal AppPool user, and grant write permission on some folders?
Or do you think set NetWork Service to the AppPool is a good idea.
In any case, I am very grateful foryour help Don and Ludek!!