ISQLPlus stopped working on 10g

Question

After install of production 10g database on Mac OS X iSQLPlus was working (so I know everything it needed by way of object libraries is there).
After reboot I get the error "SP2-00908: iSQLPlus may have been restarted without being properly shut down."
isqlplusctl start
gives a clean result "iSQL*Plus started."
Everything else works fine. I suspect therefore that some kind of log file or log file entry is left behind that stops this working. It has worked so I know everything is there.
Thanks
Paul

Answer 1

Thanks Alison
what you said pointed me in the right direction to solve the problem.
My system did have ORACLE_HOME and LD_LIBRARY_PATH defined.
However, the isqlplusctl.pl script is called from $ORACLE_HOME/isqlplusctl unix shell script. This script has a comment from an oracle programmer meerabat dated 11/18/04 where an environment variable DYLD_LIBRARY_PATH is set for MACOSX. This variable is conditionally set according to an environment variable uname which was undefined on my system.
So I set the uname variable and the DYLD_LIBRARY_PATH to /System/Library/Frameworks/JavaVM.framework/Libraries in my .bash_profile and everything now works. The isqlplusctl script now adjusts the DYLD_LIBRARY_PATH correctly to look in oracle libraries first.
I also noticed that LD_LIBRARY_PATH included an $ORACLE_HOME/lib32 assignment which is not in my $ORACLE_HOME.
Perhaps Oracle could tidy up these scripts a bit?
Paul.