Letters 'messed up' when InDesign CS4 file is exported to PDF - how to solve?

Question

I hope somebody has had this problem before and knows how to solve.
Situation: Indesign CS4.
Book file, with 130 linked documents. Everything is ready to go to Press.
I exported the book to PDF. Once I opened the PDF, in some of the rows on the text, all letters are 'messed up'!- see screenshots below.
Very strange, since I made several other PDF-exports (up to 20) in the days before - and everything went fine before.
Does anybody know how to solve this problem?
Has it maybe something to do between 'Press quality' and 'Print quality' settings?
The problem seems somehow related to the font, since everything else is just fine.
NOTE: the sentences below you cannot read are NOT made that way by me ;-), to prevent it from being able to read it. This is how it comes out the PDF.

Answer 1

Hello everyone
we had the same problem
exporting CS5 file into PDF seems to work fine but while opening the PDF file :
a) got a message telling the /Widths are corrupted for some fonts
b) when zooming on typos, we can see the approach/kerning is way not perfect between letters
c) on some text lines the letters are completly messed up ( see example below ) :
S O L U T I O N
a) open  the CS5 indesign file
b) export as PDF : this PDF will be wrong
c) keep the CS5 indesign file open, don't close it
d) export again as PDF ( different or same name ) this 2nd PDF file will be OK
SO THE SECOND EXPORTED PDF IN A ROW IS OK
NOTE :
exporting as .inx or .idml just give an  illusion
you may get an OK PDF in some circonstances
but if you close the indesign file, open it and export it : the first PDF is WRONG
hoping this will help you
please confirm or infirm this "solution"
our configuration
- Mac OSX ( 10.5.8 )
- InDesign CS5 last patched ( NOT 5.5 )
- most of fonts are OpenType ( .otf )
- the problem occurs on some particular files
- i know that these files were exported once through "book" functionnality ( could this explain ? )
Good Luck