I work exclusively with Norwegian Genealogy.
I actually don't want to get too deep into the stuff on either ACOM or RootsWeb, because until I see that ACOM generates something that resembles a good GEDCOM as it relates to your NOTE and Picture issue I don't see a point.
What you need to do is identify the NOTEs and pictures that are currently in ACOM for one person.
Find that person in the GEDCOM (open the GEDCOM in NotePad, then search for the person) Finding a person in GEDCOM can be tricky but: "given name /surname/" may work no quotes but put the "/" around the surname.
Once there you can find the NOTE record and OBJE records. That would get you on the way to telling if the data comes out of ACOM is good. If not there then it is ACOMs problem.
If the data is there it could be coded wrong. That would be the next step.