P: Random white images when exporting or publishing

My test was with a brand-new PNG watermark preset.

It looks like everyone involved has a watermark attached and some are Font-based and some are PNG-based.

Has anyone tried creating a new watermark preset and seeing if the new preset will correct the export?

I have Windows 8.1 and I tried to export more than 250 photos (few of them are white but the watermark is ok)

My photos are exported on my second hard disc (not external)
I had not problems with the lightroom 5.7
Is there a fix from adobe for Lightroom CC 2015 to resolve this problem ?

Thanks. Regards.

Carlo

PC for me

...and my exports were to local SSD.

For those of you who have this problem, are your originals photos files located on your PC or on a NAS / external hard drives?

It's happening on :

1) Windows 7 Pro Service Pack1 (Aurora R7 32Go, i7-3820, SSD HD)
2) Exporting as JPG
3) Only happening using watermark
4) Could happen on less than 50 images but the ratio is +-3 to 5 on 100

Problem is random. If I export 200 images, 2-3 are blank. If I re-export same photos with same export configuration, could be 2-3 others photos but the previous one are fine.

...and it was exporting to disk, no Internet uploads.

I reproduced the problem on Windows 8, exporting ~125 JPEGs at full size and quality 60, with all metadata, with a graphical watermark. In a batch of 125, I'd typically get one or two blank images (but with the watermark).