Could you please tell the version of Lightroom that you are working on , also the Operating System of your computer ?
Which File Format do you select while exporting the images from lightroom ?
I forgot to relay that I am on a PC with Win 7. 8 gigs of RAM and a very smooth running machine. Until 2 or 3 months ago, this has never been an issue. As a pro photographer, I need either the old system back or to find another program. Trace
Everything is up-to-date.
Actually, you're on CC 2015.1, which is many months out of date. (The CC desktop app isn't great about keeping things up to date.)
The "white export" bug was fixed in CC 2015.1.1. The most recent version is CC 2015.2.1, but you definitely don't want to take the risk in upgrading to that, since it's been no end of trouble for many, many users (for which Adobe has humbly apologized: http://blogs.adobe.com/lightroomjournal/2015/10/lightroom-6-2-release-update-and-apology.h tml).
Instead, I recommend manually updating to CC 2015.1.1, the last stable release, which you can do by downloading the 6.1.1 / 2015.1.1 update from here: Download Photoshop Lightroom.
Thank you very much John. The update you recommended fixed my issue. My recommendation to you guys is to remove the updates that are giving your clients problems, i.e. 2.1. Just a suggest. Thanks again, Trace