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Selecting text in one of my Notebooks becomes abnormal.

Here is the unselected text:

enter image description here

and here is the partly selected text:

enter image description here

When the text being selected, it should be like this:

enter image description here

What is wrong with this Notebook? my other Notebook is OK!

Here is my abnormal Notebook.

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Behavior confirmed in version 7, but I don't know what is causing it. – Mr.Wizard Jul 19 '13 at 1:41
Similar behavior in V9.0.1 on OS X 10.5.8 – m_goldberg Jul 19 '13 at 2:07
If I do a Select All on the downloaded notebook, copy the selection, and paste it into a new notebook, highlighting works as expected in the new notebook. Perhaps you can do the same to recover control over your work. – m_goldberg Jul 19 '13 at 2:28
This question appears to be off-topic because it is too localized; i.e, it applies only to local situation and needs of its poster. – m_goldberg Jul 19 '13 at 2:29
@m_goldberg You may have noticed that "too localized" is no longer a listed reason for closing. ;-) Anyway, in this case I disagree as it's a curious problem until the solution is revealed, and it could potentially affect anyone who comes across such a Notebook. – Mr.Wizard Jul 19 '13 at 6:18
up vote 7 down vote accepted

Your notebook has an option set, ShowSelection -> False, which is causing the problem. Use the Format > Option Inspector... and search for ShowSelection; then click the checkbox to set it to True. Or execute SetOptions[EvaluationNotebook[], ShowSelection -> True] in the notebook.

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Nice catch! I don't think I've ever seen that option before. – Mr.Wizard Jul 19 '13 at 6:07
@Mr.Wizard why it doesn't work for me? The option is false, but I can't make it True. Because it is grey! After I ran "SetOption[EvaluationNotebook[], ShowSelection -> True]", the option is changable. But just for one time. When I look it second time, it becomes false again. – matheorem Jul 19 '13 at 6:10
@matheorem It worked for me; I used the Option Inspector, chose Selected Notebook in the drop-down menu, and then found the option by typing it in the search field. I reset the option by clicking the "X" to the left of option name. – Mr.Wizard Jul 19 '13 at 6:17
@Mr.Wizard "choose Selected Notebook", this step is essential to success. Thank you Mr.Wizard ! – matheorem Jul 20 '13 at 8:11

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