SDL Multiterm 2017 Desktop - cannot edit existing TB (empty page and no errors)

I can open the TB and READ it but if I try to add a new entry the page gets blank like this below. I can see the tab [...] for the new entry but cannot see anything else to be able to actually populate this entry.

The same happens if I try to edit an existing entry, as soon as I press F2 the page gets blank. No errors anywhere.

I know 2017 version no longer uses Java but since the TB may be a legacy one I downloaded the latest Java version, but Multiterm still does not work.

anyone can help?