Blank page insertion causing page duplication in Acrobat

Hi,

Can anyone tell me if something has happened in acrobat in the last few weeks as I have suddenly developed all sorts of trouble on several computers at work that I never had before.

On inserting blank pages I often get either a square page even if I'm in an A4 portrait document or I get a strange blank that doesn't even have a thumbnail and won't preview:

Or it duplicates the next page and then I can't work out which is the page with the real content and which is the error. E.g here I've said insert blank after a CV and I get a duplicate of the CV instead:

Often my pdfs won't save or print and I have to extract bits and pieces and reconstruct them in new folders on the system until eventually I get a pdf that works and looks correct. This also happens with inserting any external pdfs whether I drag and drop or do right click insert.

  Please tell me I'm not the only one as this is costing me so much time when I'm under pressure! Is there a patch? My copy of Acrobat CC is up to date. I'm on Windows 7.

      Thanks

           Justine