This conversation has been merged. Please reference the main conversation: Lightroom: Increase Supported File Dimensions
I called Adobe tech support about this, and was told that there is a 65K X 65K pixel dimension limit in LR3 and PS CS5. All of the files in question are below that limit. When I mentioned this to the tech support rep, he became confused. After muttering about 2GB file size limit for a while, he told me that I should use "professional software" such as Bridge. I asked him directly if there is a 2 GB file size limit, and he said there is not.
Since that time I have done a great deal of research online and in various textbooks, and there seems to be some disagreement about the maximum file size limit in terms of actual, practical applications. I would be very interested to hear from those in this forum on this topic.