just to clarify the problem
so lets say your drop down box says "bob" and "rob"
your workflow looks at the variable set, and says 'if value_x equals "bob" then' and then it sends and email A
also it has
'if value_x NOT equals "bob" then' and then it sends and email B
and what you are finding is that regardless of what the value is set to, it always sends email A ?
If this is not right can you please clarify, can you please show us your workflow? I will post how I imagine it should work,
(also, get it to email you what the value is being set to, this will help figure out why its not working)
ps. are you using " if appropriate?
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