Can't sign in to app updates, Can't sign in to app updates

Cannot sign in to update ibooks author.

OK so here is what seems to be the problem -- Apps and under which account they were purchased / downloaded. My wife had downloaded a slew of apps under my Apple ID in the past, so when she attempted to sign in with her Apple ID there is now a conflict (this was not an issue before iOS 5.1 or so it seems). This simple fact totally prevents access to the App Store. This explains why my iPhone could connect to the App Store (it only has apps downloaded with my Apple ID) and hers could not.
So we sat down and made a list of all of the apps on her iPhone and iPad (the ones she wanted to keep), then went into iTunes and clicked on APPS (under Library in the left column). Once you are in there, a list of apps installed appears. Right click (option-click) on each app icon to GET INFO -- this displays which Apple ID account was used to download that particular app. (Thanks Rysz)
Thankfully all of the apps that were causing the conflict were free, so it was simply a matter of deleting these particular apps off of iTunes (on her iMac -- right click to delete) as well as her iPhone and iPad. Then all you need to do is re-download them when she is signed back into the App Store with her Apple ID.
After I deleted all of the apps, I again tried to sign in to the App Store to re-download the apps she wanted to replace. But I was still getting the dreaded error message stating "Can't Connect to App Store". So on her iPhone I went to Settings and reset the network connection, signed back in to our Airport WiFi network. Tried again, no luck. Signed out of the App store and re-signed in, and glory hallelujah -- I was now able to access the App Store and start the download process for both the iPad and iPhone (thanks Thom_D for the suggestion).
Once everything was back to normal, plugged each device in separately to her iMac and resynced in iTunes. Knock on wood, I think it is now working like before.
Hope this helps a fellow user out there.

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