'"Check For Updates" disabled (grayed out) using Sparkle framework

I'm using Sparkle to distribute updates to my OS X app. It's working well for most of my users but I'm getting reports from a small number saying that "Check For Updates" is disabled.

The only other examples I can find online are from developers who NEVER see "Check For Updates" enabled. In my case, the whole process is working great for most customers; only a few are experiencing this.

I'm not doing anything tricky. I'm set up exactly like the documentation describes (https://github.com/sparkle-project/Sparkle/wiki), including signing the framework with my developer ID. And again, it works for most.

Right now the users who are having trouble are running OS X 10.9.4 but I can't confirm if there are 10.9.4 users for whom it works.



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