jings - five consecutive posts man - that must be a record. in future, please make use of the 'modify' button to edit your previous post if it's the last in the thread and you have something to add. keeps things nice and tidy
my only thought would be that it may well be case-sensitive - the dialogue is defined as "Blackscreen" whereas looking at the error message, "blackscreen" is being asked for.
not sure if that makes a difference, but knowing flashpoint, it may well be
if that fails, zip the mission and i'll take a look.