The installer wipes caches. I've been flashing updates since 6.7 with no issues that I can see. Getting the flashing bug, but I can't seem to find anything that would be an improvement. The only bugs I've ever had were the quickpic (fixed) and on a couple builds there's an area on one of my screens that doesn't respond to touch unless you open and close the app drawer, but I can't definitely say it's rom related. I hope Sean takes this the right way, but this rom is kind of boring. No bugs, no glitches, no ongoing drama of when essential apps will work correctly, no counting the days until data will work every time, none of the excitement I've had on other roms. Flash, reboot, everything works. No patches, no build prop edits, it just works. Ho hum....