"Object reference not set to instance of an object" - error means I cannot finalise my files

Having major issues with .xlsx files (in packages that I have created). I can open and translate the files, and update the translation memory, but I cannot finalise them - I get the above error. The files are versions of files that have been successfully translated before. Some are large files, some small; some with macros, some without. This problem started about three weeks ago.

SDL Trados Studio 2017 Professional SR1 - 14.1.6284.6

Details of error in pic.

I have already tried;
making a new project,
renaming the files to something shorter,
removing letters with accents from the file names,
having someone else open the file and attempt to finalise it,
exporting the file,
restarting my computer.

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