I'm doing a pop video and I am working from 27 synced layers in my timeline with about 8 layers making the final edit. These 8 layers are a mess of NTSC framerates, 25P framerates, Long GOP 4k, and allsorts. They have Frameflex reframes, BCC vignettes and PiP's with assorted colour correction and the odd Resize zoom in. They all have a Matte key over the top to create the final frames. I've been going 3 days and its crashed ONCE. It plays so much in realtime too.
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I knock it when its bad (OMG that 'not saving my timeline all day long' horror recently....
but its nice to have the time to say that 2018.12.10 is now THE most stable and most featured Symphony version to date. Absolutely delighted!