Reply To: Another Plugin or Theme is using something to handle output buffers

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#2094

Anti-Malware Admin
Key Master

That error seems to be pointing to W3TC (the caching plugin) have you tried disabling caching and deactivating W3TC?

There could also possibly be some malicious script that is pretending to be W3TC but it would not be on a fresh new installation of WordPress unless your whole server is compromised. How many sites do you have on this server and are they all installed in subdirectories under a main/parent site?