Lightroom 3 Immutable entities error

I am having some issue with getting lightroom 3 to export.
I have about 560 images that when I try to export I get an error that says
"An internal error has occured.. Entities are immutable outside of a transaction. Cdoin Transaction,: changing text on AGLibraryimagedevelopsettings: id 556310"
I am not that computer savy I would really appreciate some help if anyone has ever encountered this error before.

Tried the first workaround and it seems to be working (upped exposure one click and then down one click). Export seems to be working now, but excruciatingly slow. I'm on a Dell Inspiron 530 (Q6600 2.4GHz 3Gb RAM) running Vista latest SP with all updates).
For what it's worth, the problem seems related to trying to export a large number of files. Doesn't seem to be related to whatever conversion is being done (have tried with jpg conversion and NO conversion and got the same error message). I tried narrowing down the photos I was trying to export (i.e. trying half each time). I was unable to find ANY problem photo this way - the problem seems to "move." Thanks for the workaround.
By the way, at the current rate of export, it will require nearly 2 hours more to export 1400 jpg files - why?

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