I am fighting this exact same issue. At 800x600 as a guest...no horizontal scrollbar. Logged in...I get it. Anyone have an answer?
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John (A cranky old man. "Looking for an echo ...")
using any control-panel install/update is like shooting yourself in the foot. It won't kill you, but you're really going to hobble around until it heals.
Using the wrong tools (Front Page, DreamWeaver) gives the same results
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