I am using Daylite 3.6 build 1436 with Leopard and it keeps crashing my Mail... does anyone have this problem? Is there a solution? There doesn't seem to be a pattern and it is really annoying!

I have the same issue. The only pattern I have noted is that it only crashes when I have the Daylite drawer toggled open on the main Mail window. If I double-click a message and toggle the drawer open from there, Mail won't crash.

I am also having difficulty with Ical in that syncing does not appear to work with the Beta Daylite.

Some more details... I pick up two email accounts with mail (Work and .mac). It seems that it fails /crashes when the drawer is open and I click on a piece of mail that is in the other account. In other words, I have the preview window showing a work email and I select a .mac piece of mail (next on the list to read) and the whole thing locks up for a second or two and then crashes... Re-open mail, select new mail and everything works fine.