Since updating to 4.4 I have found Lightoom almost un-useable. I don't know if it is a coincidence but I now find it very slow to render images with frequent "Unknown Errors", particularly with larger Panorama .tif files, which only disappear when I exit and re-start Lightroom. Also it is now refusing to export to jpg most of the time without a re-start. It seems to me it could be a memory or hard-drive problem but my PC seems to have enough space and RAM and other photo editing programs seem to run OK.... The problems were intermittent with 4.3 but have become serious with 4.4. Any theraputic advice would be appreciated....
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