Don't Have Permissions to View TM Backups?

Not long ago, I began to use Time Machine with an external hard drive. It's work very well ... until now.
I have 4 internal hard drives, all of which are backing up to TM (on the external hard drive).
Today, I neede to restore a file from one of the HDs but TM would not let me navigate beyond selecting the root drive. It gave me the message "The folder {name} can't be opened because you don't have permission to see its contents."
Mind you, I'm the only one using my computer. Upon investigation, TWO of the four HDs are giving me this same permissions message in Time Machine. The other two HD backups are normal.
I checked "info" on those two HDs and yes, indeed, I am recognized as having "read and write" capabiity.
What is going on?

Thanks - I did go there but couldn't find my specific issue addressed.
In any event - I've since discovered that the two HD in question (although I use them on a daily basis with no problem) both had "Ignore ownership on this volume" checked in the Info window. The two I COULD access (via Time Machine) did not.
So I unchecked that box on the 2 problem drives and, when I went back into TM, was able at least to select each hard drive with no error messages.
Unfortunately, execept for the "Today" state, TM would NOT go back in time to show files on either of the two  previously-locked drives for all of the yesterdays that it backed them up.
Unless I can figure out how to access Time Machine as "System" I think all those archived files are lost to me on the two drives.

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