I absolutely agree with Dennis. ever since the early DP days, my family learned to watch the guide about a week before the time change. Once we see the shows temporarly adjusted an hour to the right (later), we stop setting timers. Old ones adjust correctly back to their true air times, while timers set via the temporary, adjusted guide almost always fail. Once you get the first new guide AFTER the time shift, it is safe to set timers again.
This is a time tested observation! I usually set one 1 "test" event to see if this still holds true and it did again. This time, since I have 2 tuners, on Fri night I set up a recording for a Sun morning Nick show and SciFi show. One was set for the time slot and one was set for the show in its adjusted time. The correct time slot did not fire and the "by name" adjusted slot recorded the wrong show. Of course, to be fair, I may have scheduled the two tests too far apart and the new guide may have been inserted before the second event fired. I didn't think of that at the time. I'll try again in the spring. So far the test results, 5 yrs of PVRs and all failures. fortunately, the only time I didn't get a show we wanted was the first year with the DP. Of course with that POS, it could have actually been any number of reasons for the failure.