Error starting sqlplus

Have just installed Oracle 10.2 on AIX 5. When I run sqlplus as oracle it runs OK. When I run it as another user I get the message below

I thought the environment variables were not set, but .profiles are identical in terms of Oracle values

Any ideas?

Error 6 initializing SQL*Plus

Message file sp1<lang>.msb not found

SP2-0750: You may need to set ORACLE_HOME to your Oracle software directory  

John  

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