Could you please let me know what option is selected in the Export Dialogue under " Post Processing".
Please change it accordingly.
I'm having the same issue, except for me, Photoshop CC (2015) opens when I export from Lightroom (CC2015). I've searched both programs and can't find a "Post Processing" option and therefore, the "Export Dialogue". Am I blind or missing something?
Thanks Joe for pointing me to the setting. Mine was set to "Soften", not "Open in Photoshop". I changed the setting to "Do Nothing" and the problem went away. Thanks for your help.