I am using Mac OS X Lion 10.7.3 and Lotus Notes 8.5.3 and am having issues.
After clicking buttons like "Get Pin" for Twitter or "Get Sametime Community" for a Sametime account in the WildFire Preferences, the Lotus Notes client quits responding and you must Force Quit and relaunch Lotus Notes. If you simply type in the name of the Sametime server community you can add the account and get it working. It's almost like there is an unseen prompt box waiting for a click or input. In the case of the "Get Sametime Community", you can't get focus on the "Sametime Community Choice" prompt box.
For the Twitter "Get Pin" button you do get the following prompt and can click OK but then Notes quits responding.
I have duplicated this problem on 3 different Mac Lion machines
If you would like to do a screen share I'll be happy to show you via a Sametime Meeting
Thanks!