I have noticed that Raduga misses the start of scheduled events by around half a second - so, for example, instead of hearing jingles saying "Bridge FM", we get "ridge FM" or "idge FM".
I am using 3.9 as purchased in January this year and on Windows XP.
We have a early version of Raduga and I found that sometimes the last word of one announcements covers the first words of the next. I've found that having 1 second of silence at the begining and two at the end works well. We're a christian station so tightness isn't as important as a gentle flow.