PS CS2 lens correction causes "Maximize Compatibility" issue in LR

Question: why does PS CS2/3 convert the layer "Background" to "Layer 0"?
This is the problem (and solution):
I encountered the widely discussed "Maximize Compatiblity" issue with a bunch of PSD files (slide scans) that contained only one layer. Puzzled as I was that the layer thing apparently could not cause the problem, I reopened some of those files in PS CS3 and I noticed that each of them had had a lens correction. Just to make sure I was on the right track I applied a lens correction to a file that had been already imported into LR successfully and used the SaveAs command and unchecked the Maximize Compatibility option. The new file could not be imported into LR. So no more lens corrections? - I thought.
A closer look on the troublesome files made me learn the (only) layer had been renamed from "Background" to "Layer 0" after the lens correction was made. I used the "Flatten Image" command and this turned it back into "Background". After this, the file could be imported into LR without a problem.
I can now apply this trick to all troublesome files that have had lens corrections and thus avoid the huge increase in file size (130MB is a lot already).
Now I write this for those of you who have the same problem and are still puzzled (to help out) but I also would like to have some insight into why PS CS2/3 lens corrections mess with the layers.
Thanks.

>My conclusion would be that LR can only import PSD files that meet the following requirements:
>1. must contain only one layer
>2. that layer must be called "Background"
Your conclusion is only partially correct.
Lightroom will import multi-layered PSD files that have been saved with the preference for "Maximize PSD and PSB File Compatibility" set to On. This is clearly stated in the Release Notes and Help documents:
>Photoshop format (PSD)
>Photoshop format (PSD) is the standard Photoshop file format. To import and work with a multi-layered PSD file in Lightroom, the file must have been saved in Photoshop with the Maximize PSD and PSB File Compatibility preference turned on. Youll find the option in the Photoshop file handling preferences. Lightroom saves PSD files with a bit depth or 8 bits or 16 bits per channel.
As to the original point -
PS CS2 lens correction causes "Maximize Compatibility" issue in LR.
Photoshop renaming Background Layer to Layer 0 is a Photoshop issue, not Lightroom. When it occurs the files effectively becomes a multi-layered file, even if there is only one layer (i.e layer 0). Why using the Lens Correction filter causes the background layer to be renamed is currently unclear, but I have raised it in the "appropriate" place. In the meantime, I recommend that you set the Maximise Compatibility preference to
Always. Doing so will save non layered files as normal and multi-layered will have the
necessary* composite preview. You can continue to use the flatten command to fix the errant files.
*Enabling the Maximise Compatibility preference ensures that Photoshop creates a composite preview of multi-layered images. It is intended to enable applications that can't read layers to preview the images. Lightroom cannot read multi-layered files, therefore the composite preview MUST be present in such files.
>Has anyone noticed different behaviour with the Lr v2 beta? I'd hate to double the size of all my multilayer PSDs just so they can load into Lr(?)
Lr 2.0 will function as per Lr1.x; i.e. not using Maximize Compatibility when saving multi-layered files will mean that they are not compatible with Lr2.0.

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Message was edited by: rmig68

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PS CS2 lens correction causes "Maximize Compatibility" issue in LR

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