>Issue 2:
Thanks for the clue.
I tested in v17.1.4 and confirmed that both issue 1 and 2 were caused by certain old plug-ins.
So the only choice is to find and remove them?
If the reply is still needed:
I can tell it because the contents of Highlight (1) and the settings of WordComplete are different between A and B.
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>Issue 3:
+ Minimap
+ Status bar
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Issue 5:
When a configuration name is obsolete, the data needs to be cleared in such entries:
HKCU\Software\EmSoft\EmEditorPlugIns\WordComplete
HKCU\Software\EmSoft\EmEditorPlugIns\OutlineText