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기존의 호스팅에서 타호스팅으로 이전을 하고, 그대로 복원설치를 완료하였는데
위와 같은 에러가 발생을 합니다. 해당 head.sub.php 에러줄의 내용을 대략 확인해보니 아래와 같습니다.
----------------------------------------------------------------
92라인) header("Content-Type: text/html; charset=$g4[charset]");
93라인) $gmnow = gmdate("D, d M Y H:i:s") . " GMT";
94라인) header("Expires: 0"); // rfc2616 - Section 14.21
95라인) header("Last-Modified: " . $gmnow);
96라인) header("Cache-Control: no-store, no-cache, must-revalidate"); // HTTP/1.1
97라인) header("Cache-Control: pre-check=0, post-check=0, max-age=0"); // HTTP/1.1
98라인) header("Pragma: no-cache"); // HTTP/1.0
------------------------------------------------------------------------

대충보니 세션관련인듯한데
/data/session/ 폴더내의 세션파일도 모두 삭제처리해서 깨끗이 비워둔 상태인데
어디서 왜 이런 에러를 일으키는지 모르겠네요.

경험있으신 분들의 도움글이나 해결방법을 좀 부탁드립니다.
참고로, '웹제로'에서 '마루넷'으로 호스팅을 옮겼습니다.