In versions before Live 9, hyper threading needs to manually enabled to make Live work on certain Xeon based machines.
Information on how to find Live's version number and bit edition
Live dialog windows can appear green or black on number of Retina displays. In some rare cases, this also causes OSX to crash with a Kernel Panic. Changing the program resolution can help avoiding such issues.
Questions and Answers about the compatibility of Live on OS X 10.10 Yosemite
Due to an access rights conflict Live fails to install a file required to run ReWire on Mavericks under certain circumstances.
A guide how to set up Live, so that it will always run with administrative privileges on Windows.
Specifications for buying a computer suitable for Live.
How to troubleshoot problems with erratic mouse behaviour on Windows 8
Questions and Answers about the compatibility of Live on OS X 10.9 Mavericks
If Live crashes while starting-up or while you are working on a Live Set, please read here how to proceed in order to recover your work.