Bug introduced in 9.0 and fixed in 9.0.1

This is a more of a problem report than a question. When merging the two cells Cell1:


and Cell2:


the line immediately before the comment together with the comment line embark on a journey into another universe, leaving nothing behind than a vicious red box and the farewell greeting

"A RowBox with an invalid first argument was encountered. The first argument to RowBox must be a list."

Mathematica 9

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    $\begingroup$ upgrade to 9.0.1 $\endgroup$ Mar 8, 2013 at 13:46
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    $\begingroup$ Can confirm there is no problem with this on OS X with V9.0.1 $\endgroup$
    – m_goldberg
    Mar 8, 2013 at 14:08
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    $\begingroup$ I confirm this behavior on PC WinXP Math The same behavior has been recently reported at the MathGroup site forums.wolfram.com/mathgroup $\endgroup$ Mar 8, 2013 at 14:38
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    $\begingroup$ @Mr.Wizard yes. Button["Fix9", (NotebookWrite[#1, NotebookRead[#1] //. HoldPattern[RowBox[a_, b__]] :> RowBox[{a, b}]] & ) /@ Cells[CellStyle -> "Input"]] is the simplest fix. Or Import["http://www.mertig.com/mykeys.m"] as mentioned in this thread $\endgroup$ Mar 8, 2013 at 23:48
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    $\begingroup$ @Szabolcs yes, you are right, I meant that report. And you are right, it does not appear any more. I simply did not use Merge Cells command after having lost information with it once. $\endgroup$ Mar 11, 2013 at 8:11


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