Error Writing message in CorelDRAW X7

Having installed X7 over X5 around 6 weeks ago, it's full of problems that continue to get worse.

Now, in attempting to update a multi-page file I am getting the following:

Error Writing \\ ______\____\___\___ .cdr file. File Copy Error. Temp Drive or Output Drive may be Full.  Unable to save the file.  Try saving the file to another location or with another file name.

Cannot save the file or 'save as' the file to any other location, nor as another name.

I am running 2 x 500 GB SSD drives in a brand new system, with Intel i5-6600,  32GB Ram / Strix 980 Ti GPU, plus a secondary 2 Tb USB hard drive and a 4 TB network drive.

There is MORE than enough memory and space as I work with large video files all the time.  Never had this problem with X5.

I've tried installing patches and currently running Version 17.6.0.1021.

Hoping someone can help?