Hi tried to look for the link on previous problems on this.
As we had a problem and could not start the 887 application online, we got error messages like "you do not have the appropriate visa to apply"
I learned a few facts that others might benefit from !
2 YEARS FROM THE DAY AFTER YOU WERE GRANTED YOUR 495 VISA YOU CAN START YOUR APPLICATION.
EG. we were granted on 25/8/08 have now started it and saved it, will move along and add to it ready to lodge it after our 2 year anniversary.