Time Machine does not see old Time Capsule backsups after change in network setting?

Hi all,
Just brought our TC to our summer home for the season and have a few issues.
Instead of using it as our router, I added it to our existing AEBS network.  After doing this, all of our macs did not backup for a day or so.  Once I noticed this issue, I pointed them all back to the TC drive and backups have begun again.
However, 8 months worth of backups are no longer accessible via Time Machine on any of the macs. The files are there on the TC disk and they sorta show up in Time Machine.  That is, they are showing up on the right hand side as dates and little lines, but these dates and little lines are dead links. (the equivalent of being greyed out and unavailable)
Why did this happen when simply changing the TC network settings?  More importantly, how do I fix it so my older backups become available again?
Thanks!
Stu

The grayed-out lines mean that whatever's in the Finder window wasn't backed-up on that particular backup.
Try selecting your Computer name in the Finder sidebar (or pressing Shift+Cmd+C) before Entering Time Machine.  That will show one folder representing each the volumes (disks or partitions) currently connected.  Without changing anything on the Today (Now) window, click one of the backups in question.  That should show a folder for each volume that was included in that particular backup.

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