Never use output of compound jobs (f.i. an optimisation followed by a frequency calculation, gaussian keywords opt freq ). You should split up the output of compound jobs into separate files, for Molden to work correctly.
Molden will warn you:
WARNING: composite optimisation/frequency job The frequency job should be a separate file With First line: Entering Gaussian SystemTo split up the file, look for the string Normal termination of Gaussian , this is the end of the first run, now split the file up in two parts. (In the vi editor:
/Normal termination:.,$w output2:.,$d:x)Be sure to add the following line to the second file:
Entering Gaussian System
If you use the non-split up output, the geometrie optimisation structures will not be updated when youe use the next or movie buttons.