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Just found this in my logs. I am terribly sorry but don't know what I was doing at the time. Maybe the stack trace is useful as-is. I believe git revision was b411dcf7.
System.NullReferenceException: Object reference not set to an instance of an object
at Mono.TextEditor.UnderlineMarker.InternalDraw (Int32 markerStart, Int32 markerEnd, Mono.TextEditor.TextEditor editor, Cairo.Context cr, Pango.Layout layout, Boolean selected, Int32 startOffset, Int32 endOffset, Double y, Double startXPos, Double endXPos) [0x00045] in monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor/TextMarker.cs:315
at Mono.TextEditor.UnderlineMarker.Draw (Mono.TextEditor.TextEditor editor, Cairo.Context cr, Pango.Layout layout, Boolean selected, Int32 startOffset, Int32 endOffset, Double y, Double startXPos, Double endXPos) [0x0008a] in monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor/TextMarker.cs:280
at Mono.TextEditor.TextViewMargin.DrawLinePart (Cairo.Context cr, Mono.TextEditor.LineSegment line, Int32 lineNumber, Int32 logicalRulerColumn, Int32 offset, Int32 length, System.Double& pangoPosition, System.Boolean& isSelectionDrawn, Double y, Double maxX) [0x009cd] in monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor/Gui/TextViewMargin.cs:1511
at Mono.TextEditor.TextViewMargin.Draw (Cairo.Context cr, Rectangle area, Mono.TextEditor.LineSegment line, Int32 lineNr, Double x, Double y, Double _lineHeight) [0x0042d] in monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor/Gui/TextViewMargin.cs:2241
at Mono.TextEditor.TextEditor.RenderMargins (Cairo.Context cr, Cairo.Context textViewCr, Rectangle cairoRectangle) [0x000d7] in monodevelop/main/src/core/Mono.Texteditor/Mono.TextEditor/Gui/TextEditor.cs:1608
very, very strange.
I suppressed it - it shouldn't happen anymore, but why that happened would be interresting.