If some section "S" in some notebook contains subsections which do not contain "FormalTextInputFormula"-cells (and "S" itself does not contain such cells either), then displaying the knowledge browser leads to an error. This happens most likely because an empty list is transposed somewhere in function "structView" in "GUI.m".
If some section "S" in some notebook contains subsections which do not contain "FormalTextInputFormula"-cells (and "S" itself does not contain such cells either), then displaying the knowledge browser leads to an error. This happens most likely because an empty list is transposed somewhere in function "structView" in "GUI.m".