changing permissions for /dev/misc/rtc in /etc/udev/permissions.d/50-udev.permissions has no effects for example, I changed rtc:root:root:0660 in rtc:root:root:0664 and I found: crw-rw---- 1 root root 10, 135 12 giu 01:09 /dev/misc/rtc instead of what I expected to see: crw-rw-r-- 1 root root 10, 135 12 giu 01:09 /dev/misc/rtc I've fixed the problem by substituting rtc:root:root:0664 with: misc/rtc:root:root:0664 (Sorry for my poor english)
Fixed in 027 release.