I just upgraded BulletProof Security to version .47.8 and I'm also running W3 Total Cache version 0.9.2.5. After doing the BulletProof Security upgrade, W3 Total Cache informed me the permissions on the .htaccess file were set such that it couldn't enable disk or browser caching since it couldn't update the .htaccess file.
So, I took a look at the CURRENT, post-BulletProof Security upgrade .htaccess file and found the Apache directives W3 Total Cache wanted to put in the .htaccess file were ALREADY in the file. I'm not sure why W3 Total Cache determined browser and disk caching were not active since the Apache directives for those functions ARE in the .htaccess file W3 Total Cache can't write to.
I was going to submit a bug report but I didn't want to submit the URL of the site, in question, due to it being an adult site.
When I look at the HTML source of various pages of the site, when viewed in my browser, I see the W3 Total Cache HTML comment at the bottom of the pages.
Is this a bug and should I file a formal bug report?