Any know backward compatibility issues with 9i?

Hi,

did someone encounter problems with running/porting apps on 9i (not in compatibiltiy mode) which worked on 8.1.7 ?

-- 
                                                   Andreas
if ((sex==fem)&&(hobby==comp)&&(age~25)&&(status==single)
&&(cntry=GER)) goto http://www.kochandreas.com/home/single.htm