I have the most up to date version of all three Lightroom CC apps (iPhone, iPad & Desktop for Mac) and I am noticing an issue with Exporting.
Specifically on Desktop, exporting at a custom resolution becomes a problem when you try to choose a Long Side resolution of more than 2560px. If you choose just one pixel over that number Lightroom blows the scaling out of proportion. It zooms in super close at 100% scale as if the image is much higher resolution than requested.
I forced the export of an image at a chosen 3000px resolution to see if maybe just the preview scaling was affected but the resulting exported image shows a resolution of 28375 x 18920 at 7ppi (all previous exports are at 240ppi at the proper chosen dimensions).
When choosing to export at a resolution higher than 2560px the preview image also breaks, meaning only a portion of it shows on screen when choosing "Fit" as the scaling option. The bottom half of the image just shows black.
There is also an issue with export on the iPad version. Unlike the desktop app, I can choose to export at a specific resolution higher than 2560px and still keep 240ppi without any scaling issues. But, when choosing "Largest available dimensions" under the Dimension drop down menu, the resulting exported image is created at 2560 x 1707 even though the original image resolution before export was 8256 x 5504.
I am going to assume that this issue is stemming from using Smart Previews as the 2560px resolution seems to ring a bell.
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