Can't Update Tasks from PWA

[Mazzz]

When I, as project manager, click on Update to update the tasks into Project
from PWA, it comes back with red flags in (i) column and red color words on
top column of the table saying "Save your project file with this task
change". I also can't change the "Accept" column...status there is permantly
set to word "Accept"

Any help will be highly appreciated.

Regards,

Mazzz