Changing APPS Password

DBAS,

I have few questions related to changing apps password.

1) when I change apps passwd by alter user statement..When I connect through
sqlplus and try connecting
as apps with new passwd,it connects.
When I run adadmin and when it prompts for apps passwd,it fails connecting
with the new apps passwd.
When I open frontend,the login page opens but the forms session fails to
open..

2)When apps passwd is changed through FNDCPASS..When I connect through
sqlplus and try connecting
as apps with new passwd,it connects.
When I run adadmin and when it prompts for apps passwd,it connects without
any error.
When I open frontend,the login page opens but the forms session fails to
open..
In both cases forms session fails to open..Can anybody explain the reason
behind this
and why when I run adadmin in the former case it fails connecting with new
apps passwd but in the later case
when I change through FNDCPASS new apps passwd comes into effect.

Thanks in advance ..

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