PIA 2.1; "Uninstalled" Tab screwed up

[Atkatla]

Ok,
after using several plugins for some time, I wanted to add anotherone. During that, I discovered that the uninstalled tab does not work (please see the attached image). The grey field ends and there is no further message like "Last scan".

I assume wrong access rights in the file system could be the reason. So which access rights should be defined in the plugin-folder?
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cacti 0.8.7b, PIA2.1, spine, boost svn, weathermap, monitor, thold

[Atkatla]

I ran further tests and discovered that the "uninstalled" page is only broken when the setup.php exists in the "plugins/boost" directory.