can you please give me some information on your systems:
What exact OS X version and machine are you running on?
What is the version of your 3DxWare for Mac?
To get this information, please open the System Preferences -> 3Dconnexion.
If you've installed the official driver you now go to the Configure drop down (where the application configuration are listed) and select "About 3Dconnexion".
If you happen to have the beta driver from our "Lab's" page, then just open the "Tools" section - you find the version number in the lower left.
In the case of a crash:
Is there a crash report available? Please send it to me!
If you're able to reproduce the crash scenario, please also send me a short description on how to do so.
Regarding Alias, are you talking about Maya? Which versions?
Please, let me know as much information as possible!
Just to encourage you: I found no issues with Lion and Sketchup (also Maya).