Once in a while, the yellow minimize button on some windows is greyed out, and the Window → Minimize menu entry is likewise disabled. Right now, for example, this is the case with two open Terminal windows. If I open a new Terminal window, it can be minimized, but the old ones remain unminimizable (if that's a word). I tend to think of this as a bug. Or is it a feature? If so, what causes it, and what can I do to enable minimization of these windows?

  • That looks like a bug, are you on the latest OS X with all updates installed? I can't reproduce this behavior. – houbysoft Jun 26 '12 at 19:58
  • Are any other menu items disabled? The menu items for quitting applications (and sometimes other menu items like the ones for closing documents) become disabled all the time on my account for some reason. – Lri Jun 26 '12 at 19:58
  • Strange. I use Terminal.app on Lion all the time, and I don't recall ever seeing this. – Ken Jun 26 '12 at 22:19
  • @houbysoft: Yes, latest Lion, all updates. But I have seen it on older versions too; not sure for how long. Also this is on a new laptop. Rather than using Migration Assistant, I set this one up from scratch, to avoid bringing in cruft from countless generations of laptops. Also, I can't reliably reproduce the problem. It seems to pop up at random. – Harald Hanche-Olsen Jun 27 '12 at 5:44
  • @LauriRanta: No, the only other disabled menu items are expected ones. – Harald Hanche-Olsen Jun 27 '12 at 5:45

There was an old QuickTime bug that caused the minimise button to become disabled on some windows.

But also be aware the app can disable the minimise button itself.

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    Thanks! Thought I haven't seen this problem in what seems like ages, now I know at least a little bit more about it. I'll accept this answer, even though I may not be able to verify it. – Harald Hanche-Olsen Feb 28 '18 at 12:16
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    Holy moly the steps for that Quicktime bug worked, thanks! – Robin Zimmermann Mar 5 at 21:23

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