BuddyPress Activity+ Image Upload Post Update Button Missing

I am experiencing an issue with BuddyPress Activity+ Add Photos button not posting the update live once adding images is selected and included. Pushing the button simply appears to clear the post upload and no new post is shown. When I refresh my page/browser and the image then appears correctly in the feed. The lack of refresh only occurs sometimes - not consistently. I am running the MediaPress plugin and have the option for Allow Activity Upload? set to "No" as I saw on the installation page for it since it's a known conflict. I have no JavaScript errors showing with the wp-config.php set to debug. The site is still in development, but sitting on a live server. Can you please advise? I would be happy to provide you with user credentials of whatever level you requirements you need.