I think I found the solution to my problem:

As this particular TM on Dropbox, I figured out that the creation of duplicates could be connected to a bad internet connection. We've had some problems yesterday, which I thought had been fixed, but apparently this morning we were still having some hiccups).

Now the TM works fine again, and it's still on Dropbox! :-)

I've also tried to move the TM to a local folder, and it works perfectly there too.

Now I'm curious, if the people who experienced the same problem some time (or years) ago, had their TMs stored on a cloud drive.

Have a great weekend!

Sabina

Thanks for coming back with this Sabina Fata.  I think cloud drives are amore common problem than people admit to.  I don't think anyone does this on purpose but today's computers just default to cloud drives, particularly with OneDrive and if you don't take care to save your resources and projects somewhere off the synching to the cloud you can run into trouble.  Cloud drives are fine for small files or files you work with occasionally, but not for large files or files that are written to every few seconds throughout the day.

Trados Team/Enterprise is a managed solution for sharing these kinds of large resources in the cloud, and all Freelance users now can use a Translation Engine on the same platform if they choose.  But I guess the problem will always be when you want to work offline as synching the local and cloud resources needs to be more seamless to make this a really useful experience.

Dear Paul, you are completely right!

I am wondering if there are any other situations where TUs get duplicated, besides cloud storage...

P.S. I love Trados Team! :-)

Dear Paul ,

I've just discovered that if I (re-)Build the Translation model and (re-)Align TUs in the TM Fragment Alignment Settings pane when the TU duplication problem appears, the TM goes back to working normal, without creating any more TUs duplicates. Does this make any sense?

Thank you very for your help.

Kind regards,

Sabina

Sabina Fata 

Sabina Fata said:

Does this make any sense?

I think so.  When you do this you give the TM a "fresh start" and it can attempt to resolve the problems caused by working in this way.  It's certainly good advice for anyone who does try to work in this un-supported manner.  I think as cloud technology becomes more the norm, and the integration with desktop improves, working with the supported cloud for sharing will be preferable.

Sabina Fata 

Sabina Fata said:

Does this make any sense?

I think so.  When you do this you give the TM a "fresh start" and it can attempt to resolve the problems caused by working in this way.  It's certainly good advice for anyone who does try to work in this un-supported manner.  I think as cloud technology becomes more the norm, and the integration with desktop improves, working with the supported cloud for sharing will be preferable.