Possible bug in iTunes 10.6 - keeps re-syncing songs

I have several hundred MP3s of very old songs from the 1910s and 1920s which sync to my iPod without problems.  When I acquired an iPhone 3GS with more limited capacity, I set iTunes to "convert higher bitrate songs to 128Kbps AAC".  This worked fine under iTunes 10.5.  Now that I have "upgraded" to 10.6, iTunes keeps re-syncing and re-converting some -- but not all -- of the higher bitrate songs.  Apparently iTunes is flagging these songs for re-syncing, which takes  hours since they all must be converted to 128Kbps.
I tried to detemine whether the file type, ID3 tags, sample rate, LAME encoder version, etc., were to blame.  In all these cases the re-syncing occurred with some songs but not others.  I then began to notice that the re-synced songs are monaural, single channel, while stereo songs do not keep re-syncing.  As an experiment, I used the menu option "Convert to AAC" on one song.  That song synced and then did not re-sync.  Examining the original and converted files in Audacity showed that the conversion did not add a channel, but the bit depth changed from "32-bit float" to "16-bit PCM" and the bitrate went from 320 constant to 128 VBR.  The menu option "Convert to iPod or iPhone version" is grayed out, and in any event I don't know what it does.
At this point I'm frustrated.  I don't want to load up iTunes with duplicate songs, and I don't want to delete my higher bitrate files.  I have no idea why iTunes should favor one file format and reject another. 
Audacity can convert individual songs to dual channel but does not have a setting to batch-convert channels.  I don't know of any other utility that will batch-convert single channel to dual channel; I tried Switch and Max, and while they have a setting to export stereo, they don't seem to convert mono to stereo (joint or otherwise).
Can anyone explain why this is occurring? Any suggestions for batch-convert utilities or other workarounds?

well, I couldn't wait till next week to sync the little ol' iPod again, so did it today today, and yes... the re-syncing problem is definitely caused by the monaural files. or rather, the fact that the syncing program in iTunes is configured in such a way that it keeps looking at these files as 'new' and in need of syncing, or something like that... so, if there's anybody out there who knows how to get this info to the right man at Apple, please don't keep us in the dark...
it probably is fixed easily, but before that happens it'll probably have to go through heaps of red tape... we'll sit it out 'till then, just sitting there, in our gloomy rooms, handling the mono to stereo thingies, doing our thing... sniff...lol
cheerio...

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