Time Machine back-up inaccessible following OSX upgrade

Thanks for the response.

OK, rightly or wrongly, I use both applications - I found that I needed to open WD Smartware to unlock the drive for Time Machine to work. So, I would see Smartware categrise the storage, but Time Machine would then do the backups. 

Now, Time Machine can’t see the backups, and when I open (the new version of) Smartware, it acts as if it is a new drive and asks me what I want to do. If I click on ‘retrieve’ for example, there is no sign of the Time Machine back-ups - I think this is what you would expect (as Smartware didn’t do the back-ups), but Time Machine still cannot see them. I tried, unlocking the drive directly using the padlock (sorry, I am writing this from work and can’t remember what it is actually called), but no improvement.

I have a vague memory of not upgrading Smartware a couple of years ago because there were stories of compatibility issues with Time Machine Back-ups, maybe when going from OS 10.8 to 10.9? Of course, now I am in this hole!

Any thoughts?

Thanks

Tim