When exporting to disk as JPeg it seems to process it then at end turns red and indicates Could not Save Image. W10 with trial version 5 installed yesterday.
Check things like disk permissions and anti-virus software. You may need to add PL5 to an exception list or something
I have found I had to add a lot of programs to Bitdefender exceptions list as it was causing a lot of problems befor.
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Interesting, I have used Bitdefender since 2008 on my laptops and desktop computers and have never added any program to its exclusion list. I’ve had a lot of programs since then 
I even had to add network and NAS address to stop it blocking the network at times
It was my anti-virus Avast Free version. PL5 was part of the allowed applications. Disabling Avast and re-enabling some how resolved the issue. Other thing that was strange is that I could export to Lightroom or other applications just fine (which writes a file to disk as well). It was just the export to disk function that had issue. Anyways all good now. Thanks!