Here's how the "resume render" button works. If you start a render (NOT using the "render to disk..." option in the menus, but by using the big round button on the interface), then Bryce starts its initial passes rendering, and saves the result in memory as it goes. If you click the mouse while Bryce is rendering (unless you're switching to another application) or press escape, then Bryce stops rendering, but it keeps the image it's already rendered in memory, INCLUDING a map (in the 4th channel) of the render progress. If you then click the "resume render" button (or choose it from the menu), it will pick up where it left off. But that's not all. If you quit Bryce, it will save the image AND the progress map, so you can quit, shut off the computer, whatever, start Bryce back up, and resume rendering just by opening the file. Two things to remember: (1) you must select the "save image with file" option in the preferences. it's selected by default, so if you turned it off, you need to turn it back on. (2) in older versions of bryce, if you double-clicked on a scene (.br4) file, it started a new render once Bryce booted up. I haven't tried this in awhile, so it might still behave that way. If that's the case, then you need to start Bryce from the application, then use File/Open to open the image. Then just hit resume render. Of course, some of the people who do really long renders just either (a) forgo the use of their computer until it's done (b) use their computer with Bryce running in the background (which really slows down everything, including the render) or (c) have a dedicated render machine that they do their renders on. --flick