1 pointThe edit below made this workflow functional for me on Mavericks. It changes the referenced version of Ruby from the default (2.0) to 1.8, which works with this script. Select the workflow. Double-click on each workflow item to edit it (the pair and next Script Filters, and the two /bin/bash scripts), and make this change in each: Replace /usr/bin/ruby with /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby then save.
1 pointI'm not entirely sure why this is happening, and I've yet to be able to reproduce it. Having said that, I do have a likely fix for you... If you update to the Alfred 2.2 pre-release (from Alfred's Update prefs), I've added an option which allows you to use the OS X metadata to search contacts which you may find faster. Once updated, Open Alfred's preferences to the Features > Contacts > Advanced and select "Use Spotlight metadata for searching contacts". Hope this helps Cheers, Andrew