I've run into a couple of issues with workflows that worked before going to Mavericks. Not sure if the workflows need tweaking, or if there is a compatibility issue, but here's a couple that I'm having trouble with:
https://github.com/neilrenicker/alfred-harvest
Trying to run the setup on this, you type "hv" <space> "setup", and then Alfred flips over to doing a Google search. It's supposed to accept some arguments in order to set up authentication -- but it doesn't do that.
I've run into a similar problem with arguments using the Github workflow here:
https://github.com/zenorocha/alfred-workflows
This one definitely worked on 10.8 but upgrading to 10.9 has made the arguments work in strange ways.