I'm getting warnings of unsupported calendar entries, pertaining to calendar entries which are not repeating, nor do they have any unusual characteristics. Also, they may go away inexplicably. For example:
On 17/9/09 created a meeting from 10am-4pm (Australian Eastern Standard Time) for 2/10/09. This did not sync from Lotus -> Google. Meeting did not have any unusual attributes, just a title, date, one attendee (myself) and a location.
However, changing the date of the meeting back to the 23/9/09 caused it to sync properly from Lotus -> Google. Then changing the date back to 2/10/09 did not stop it from syncing, it continued to sync correctly.
I'm not sure what could have caused this. FYI, daylight savings in AEST time do not start till 4/10/09, so I don't think it's a DST crossover issue. I'm using Lotus Notes 6.5.
I've tried to be as specific as I can in my description, but feel free to ask me for further detail.
Many compliments on a very good tool, I hope this assists you to resolve this problem.