C1 v.20 and jpg/tif healing edits won't preview properly - black blocks

Started 8 months ago | Discussions thread
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Bbawt1 Forum Member • Posts: 94
C1 v.20 and jpg/tif healing edits won't preview properly - black blocks

Searching around I can't find a definitive answer on this.  C1 v20 works great on my .raf RAW files including spot removal or healing brush. But on .jpg or .tif files using healing brush makes the preview rendering not update properly - black random blocks appearing and disappearing especially zooming in and out. The .jpg files are small, only a few MB each so I can't imagine its a processor or video problem since there is no issue using 40MB .raf files.

I saw a question about this on the C1 forum and the "answer" was to upgrade to v21, but that's expensive and other than this issue, v20 is fine for me.

Anyone else experience this or have ideas? I did try turning off hardware acceleration but that didn't do anything.

A couple of examples:

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