Question: Professionally I customize software modules on a well-known software package. The version we are working on is one version back and about a year old. Is continuing to work on this old software version hurting my professional marketability?

The short answer to your question is no, not yet, unless it was a major release that is being quickly and widely adopted.

The longer answer is that, in my opinion, a techie’s skill set from a marketability perspective has a two year half-life. That is to say, that the exact set of skills you have today will only be half as marketable two years from now.