Safari History Bepuzzlement

I have a problem with Safari and the solution eludes me: Safari wipes clean the History menu when I quit it. I can accumulate even several days of links, quit the browser, and find them gone. This has been the case ever since firing up a copy of Safari Enhancer on my old iBook, and now on the new machine (with a copied-over preference file). I don’t recall modifying any history-related settings with Safari Enhancer, and no pertinent value (ie: DumpHistoryAndPissOffal3x = 1) exists in the com.apple.Safari preferences/defaults. Grr.

Oh vast knowledge of blogdom, lay thy wisdom before me!