Why does SQL Developer sometimes not allow me to "Disconnect"?

Sometimes when I'm ready to close SQL Developer, I try to get out gracefully, but the "Disconnect" option for the only connection I have open is greyed out. Why? The only option I know then is to close SQL Developer by clicking the "x" in the upper, right corner.
My version of SQL Developer is a bit old: I have SQL Developer 2.1.0.63. We have an Oracle11.1.0.7 database. I have a 64-bit Windows7 desktop. I think my Java version is also a bit old, but it seems to be compatible with the EBS R12.0.6 application that I need to support. I'm not a Java expert. If I go to a C:\ prompt, and type: "java -version", It returns: "1.4.2_04".

Actually, I think the link Alessandro posted is helpful. I cannot reproduce the behavior on Win XP, but can on Linux (somewhat). That is, Properties gets greyed out at times, but not Disconnect or Apply Filter. Retrying the right-click resolves the problem, as he notes.
So I assume my point (1) would be more nearly correct if restated as "Bug or timing issue".
As for (3), I really cannot give a good example. If I open a Tool menu item like Monitor SQL or Monitor Sessions on, say, the SYSTEM user, the Disconnect option is not greyed out and if used will close all the open windows for that connection. If I run Debug on a package/procedure/function, Disconnect also remains enabled. Clicking on it produces a "Cannot Disconnect" dialog warning with this text: "The database connection cannot be closed while an active debugging session exists". Perhaps I'm mistaken entirely, or just confused after seeing that behavior on some older version of SQL Developer
-Gary

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>
I now have SQL Developer 2.1.0.63.
>
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>
I think my Java version is also a bit old
>
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>
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>
Did you notice that last line?
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