I am convinced that this is a duplicate of another JIRA bug, but I can't seem to find the other one. I needed to import work history from Bugzilla, so I patched BugzillaImportBean.java. This is a simple patch, and does not retrieve the comment associated with the work, only the hours worked and the timestamp. If you view the All tab, the work log entry should occur just below the comment. This patch also sets the time estimate and time remaining - hopefully correctly.