10g Express Edition; Problem saving updates in Script Editor

Question

I'm running 10g Express Edition on Windows XP Media Center with SP3 with Internet Explorer 7.
I start with 'Go to Database Home Page'.
Then take the path Home>SQL>SQL Scripts>Script Editor;
I've created a Script called HW.
I make some changes to the script
Then I click the 'Save' button.
Then I click the icon for my HW script.
But when I look at my script my updates are not there.
This does not happen all the time.
Sometimes the save seems to work, and sometimes it doesn't.
I've noticed the same thing with Run. Sometimes my changes
will appear in the script that got Run. Sometimes they won't.
Any ideas on what I need to be doing to consistently Save my
updates in Script Editor? fwiw, I like Script Editor for what I need
to do - create scripts, export them as .sql files, etc. But I'm not
opposed to using another tool to do this.
Thanks.

Answer 1

SQL> select owner,object_type,status from all_objects where lower(object_name) = 'dbms_xdb';
select owner,object_type,status from all_objects where lower(object_name) = 'dbms_xdb'
ERROR at line 1:
ORA-01219: database not open: queries allowed on fixed tables/views only
So, I have tried the following:
->
SQL> alter database open;
alter database open
ERROR at line 1:
ORA-01507: database not mounted
SQL> alter database mount;
alter database mount
ERROR at line 1:
ORA-00205: error in identifying control file, check alert log for more info
SQL> alter database create standby controlfile as 'ora_control1' reuse;
alter database create standby controlfile as 'ora_control1' reuse
ERROR at line 1:
ORA-01507: database not mounted
I'm quite confused right now.