I inherited a coworker's Mac running an old beta (0.8) of the mobilesdk. So several weeks ago I downloaded and installed a fresh copy of Titanium Developer 1.2.1 (plus SDK 1.4).
I had many problems building and running, and finally figured out that there was still an old copy of the 0.8 beta mobilesdk in /Library/Application Support/Titanium/mobilesdk/osx, even though my new sdk's were installed in ~/Library/Application Support/Titanium/mobilesdk/osx (i.e., the beta was installed in the Library at root [/] but my new ones were installed in the Library in my user directory [~/]). After clearing out the mobilesdk directory on the root Library, everything was fine.
When Titanium SDK was upgraded to 1.4.1 and 22.214.171.124, it auto installed correctly to my user directory's Library.
Today, when 1.4.2 auto installed, it installed back in the root Library.
Can someone tell me which is correct? Should the mobilesdk be installing at /Library or ~/Library? Does it matter if some sdk's are in one and some in the other? In both cases, my account has read/write permissions but the admin account has read-only access. That doesn't sound right for something in /Library.
In case this still of any use to you Lou, these are the official install instructions for the Continuous (nightly) SDK Builds.
As far as I know the correct path for all of the different mobilesdk versions should be /Library. That's where they've always been on my Mac's anyway.