In Simon 1 (Windows CD English) on Mac OS X 10.2.8 and WinXP 0.10.0svn, sometimes the inventory arrows disappear. I see this most after a dialogue scene and then you click the arrows, they disappear. You can still click where they are supposed to be, and it works, but you cannot see them.
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Please try the current windows snapshot, and report if it helps.
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Yes, it is much better now :)