Missing image upload button

I wasn't able to view the buttons last week. It was because Flash hadn't been updated. So I suggest you make sure Flash is up-to-date first.

Other suggestions:

You could try restarting the browser

Or in the php.ini file change upload_max_filesize = 100 M to upload_max_filesize = 100M, (no space) or

Check if .gitignore is referencing media/ instead of /media/ or

Copy /app/design/adminhtml/default/default/template/dull from a fresh copy of magento

That problem come up to me after Chrome update (Version 59). To solve this I just click in in Flash permissions.

Or enable Flash folloing this link