Orbital symmetries

Dear All,
 I did  uhf calculations to chek the stability of
 wavefunction for the organic molecule when it is in
 gas phase or in supercage of zeolite using Gaussian
 98. I have the response to confirm the wave function
 stability. Do I have to do  wavefunction optimization
 with stable=opt keyword?
 My second question is to related orbital symmetries
 for that molecule. I could obtain the orbital
 symmetries for the molecule when it is gas phase, but
 in the case of supercage I can not have the orbital
 If someone would like to explain this differences, I
 would be glad.
 All the suggestions and explanations will be summarised.
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