If you've applied a Workflow rollup for 7.1 SP1 (I'm assuming thats what you meant by 7.1.1), your assembly version numbers will look like 7.1.1401.*. 7.1.1400 was SP1 initial release, and 1401 is the rollup.
Rollups are meant to be collections of fixes that Workflow customers can apply over and over (via a standard Workflow install/upgrade) to get the latest batch of fixes, if they choose.
If you could tell me a case number or describe the issue you're looking to see fix, I can check the codebase and definitively see if it's in the latest rollup.