Though my settings are to refresh my podcasts every hour, lately they have not been refreshed at all

Mac mini 2.3 GHz Intel Core i5 running 10.8.2, 192 GB free
8 GB memory, using 5 GB
iTunes 11.4
Ever since I upgraded (by force) to iTunes 11.4 I have been having quirks (like when I hit the word Podcasts in the Library panel there is always a delay in going to that screen, and I am constantly being barraged with messages asking if I still want to receive certain podcasts because I haven't listened to them in awhile, which is often untrue), but over the holiday weekend I began to notice that many of my podcasts were not refreshing, even tho' I have them set to refresh every hour. I starting looking in the iTunes store and discovered that there were several episodes of several different podcasts which had not been automatically downloaded, so I manually downloaded them. There may be more, as I haven't gone through them all.
Also, on each of the pages in the iTunes store of each of the podcasts to which I subscribe it has a "subscribe" button, so I wonder why it says "subscribe" when I already am subscribed. I can't remember if in the past it read "Unsubscribe" for podcasts to which I already have a subscription.
What could be causing this problem? My computer is always on, and this has never happened to me before in all the years I've been subscribing to podcasts.

More info:
I repaired my Disk Permissions twice, and each time I got a ton of corrections regarding iTunes. Here are just some of them (don't know what all the "Dutch" ones are about):
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/AACEncoderConfig.nib”; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/AACEncoderConfig.nib”
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/AskUser.nib”; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/AskUser.nib”
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/AskUserWide.nib”; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/AskUserWide.nib”
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/AutofillSettings.nib”; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/AutofillSettings.nib”
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/BurnSettings.nib”; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/BurnSettings.nib”
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/CDInfo.nib”; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/CDInfo.nib”
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/ConvertID3.nib”; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/ConvertID3.nib”
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/EQPresets.nib”; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/EQPresets.nib”
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/ErrorReportDialog.nib”; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/ErrorReportDialog.nib”
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/FormatPopup.nib”; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/FormatPopup.nib”
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/HomeSharingServerSettin gs.nib”; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/HomeSharingServerSettin gs.nib”
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/ImportSettings.nib”; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/ImportSettings.nib”
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/InfoDialogArtworkView.n ib”; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/InfoDialogArtworkView.n ib”
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/InfoDialogInfoView.nib” ; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/InfoDialogInfoView.nib”
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/InfoDialogLyricsView.ni b”; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/InfoDialogLyricsView.ni b”
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/InfoDialogMultipleInfoV iew.nib”; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/InfoDialogMultipleInfoV iew.nib”
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/InfoDialogMultipleItem. nib”; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/InfoDialogMultipleItem. nib”
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/InfoDialogMultipleOptio nsView.nib”; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/InfoDialogMultipleOptio nsView.nib”
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/InfoDialogMultipleSorti ngView.nib”; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/InfoDialogMultipleSorti ngView.nib”
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/InfoDialogMultipleVideo View.nib”; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/InfoDialogMultipleVideo View.nib”
Permissions differ on “Applications/iTunes.app/Contents/Resources/Dutch.lproj/InfoDialogOptionsView.n ib”; should be drwxr-xr-x ; they are -rwxr-xr-x .
Repaired “Applications/iTunes.app/Contents/Resources/Dutch.lproj/InfoDialogOptionsView.n ib”

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