Reply from Ableton support:
Hello -----,
Thank you for getting in touch with Ableton Support.
We are sorry to hear about your issues with Ableton Live.
The fan noise sounds pretty much like an hardware issue you should further investigate on the Apple forums, I am afraid.
The "Indexer not responding" is a known issue with Mavericks, explained more detailed in this article:
https://www.ableton.com/en/articles/indexer-appnap/
Basically it is wrong information you get from your Activity Monitor.
Should the test explained in the article not work, it could be another reason.
In this case please get back to us and we will have a look into your Report.
Hopefully this helps.
If you have further questions, please feel free to get back to us at any time.
Best Regards,