"As soon as export is selected, LR stops responding and becomes non-responsive." 1. Do you mean LR stops responding immediately after you do the menu command File > Export...? Does the Export settings window open? If this is what you're seeing, try resetting LR's preferences: https://www.lightroomqueen.com/articles-page/how-do-i-reset-lightrooms-preferences/ LR sometimes soils its preferences file, and resetting it can fix all sorts of wonky behavior. That article explains how to restore the old preferences if resetting doesn't help. 2. Or do you mean that LR stops responding after it actually starts exporting the first photo (after clicking the Export button at the bottom of the Export settings window). If this is what you're seeing, try setting Preferences > Performance > Use Graphics Processor to Off. In addition to the integrated Intel GPU, your Intel Mac has a Radeon GPU: "Metal: AMD Radeon Pro 560X Init State: GPU for Image Processing supported by default" In the past year or so, there have been many problems reported with LR on Intel Macs running AMD 500- and 5000-series GPUs, most probably caused by bugs in the AMD graphics driver. After more than 6 months, Apple released a new version of Mac OS containing an updated graphics driver that fixed some of these problems, but there continues to be a trickle of reports here about continuing issues. Unfortunately, old GPU chipsets on Intel Macs are not a priority for either Apple or AMD (Apple would prefer Intel Macs disappear as soon as possible.) You might try disabling the integrated Intel GPU, which Adobe recommends. I'm doubtful that would address your problem, but it's worth a try; see step 5 of solution 4: https://helpx.adobe.com/lightroom-classic/kb/troubleshoot-gpu.html#solution-4
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