I suspect that you might be encountering the bug that was introduced in LR CC2015.10, and which causes the "Camera Raw Mis-match" dialog to be issued when in fact no Camera Raw (ACR) mis-match occurs. Explanation: Assuming you are working on a raw file, when you use the "Edit in Photoshop" option the resulting action depends upon the respective versions of ACR (within LR itself, and the ACR plug-in to PS). If the version of ACR in the PS plug-in is at the same or later level than the version embedded within LR, there is no problem and LR will pass all relevant file details to PS, and PS then uses its ACR plug-in to render the raw file into temporary storage, from where you can start applying the PS edits. Only when you subsequently "Save" in PS is the TIFF/PSD written to permanent hard drive storage and added to the LR catalog. If, OTOH, the ACR plug-in within PS is at an earlier/lower level than LR, there is the possibility that some edit features within LR may not yet be available in the ACR plug-in, so having the ACR plug-in automatically render the raw file could result in the file having a different appearance than in LR if those features have been used in the image in LR. In this situation, i.e. there is an ACR mis-match, then the afore-mentioned dialog message would be issued, giving the user the choice of either "Render using Lightroom" or "Open Anyway". "Render using Lightroom" would normally be the correct option, as this will ensure that all edits from the LR feature set would be included in the rendered file, the only downside is that the TIFF/PSD is rendered first, and appears in LR first, before it is then opened in PS (so if you subsequently decide to abandon the PS work and close the file in PS without saving, it will still unnecessarily exist in LR). "Open Anyway" preserves the "normal" workflow, i.e. the raw file is rendered by the ACR plug-in, so will only appear back in LR should you subsequently "Save" in PS.....but this could be at the cost of missing edits that were applied to the original raw in LR but which could not be interpreted by the ACR plug-in due to it being an older version. So if you are running the latest 2016.10 version of LR, and the Camera Raw plugin in PS2017 is at 9.10, then there should be a seamless workflow between the two applications. Unfortunately, as I mentioned earlier, there is a bug in LR 2015.10 which causes the "mis-match" dialog to be issued even though no mis-match exists. In this situation the correct response should be "Open Anyway", in which case you'll only see the TIFF/PSD back in LR should you "save" in PS. If you are seeing the TIFF/PSD rendered first in LR, then this indicates that either: - You are selecting "Render using Lightroom", which in this instance is not necessary, or - You have previously encountered the mis-match dialog and clicked the "Don't show again" box whilst selecting "Render using Lightroom", i.e. that is now the default option when an ACR mis-match is detected. You can clear this by clicking on "Reset all warning dialogs" on the Lightroom Preferences>General tab, which will cause the dialog to be issued again next time you use "Edit in PS". Apologies for the lengthy response, but this may be helpful to others even if this isn't your situation (and if it's not, please get back to us).
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