still crashes with previous reaper version, and thanks for the tip about portable install. didn't have to "trash" my current install, yay. as the event viewer was mostly telling about different *.sep files, i googled around and seems those files are created by synthmaker. and now i've been using non synthmaker synths for hours and not a single crash, yay! there was also ms-windows vista updates around the same time when these crashes started to happen, so i'll maybe test tomorrow if i can undo any of those and see if it makes a difference.