You're safe to install 8.1.1 with Max 5.1.1.

Thanks!

Yes!!

So, is it possible to determine which version(s) of Live are compatible with which version(s) of Max? Is there a well-defined outcome if the versions do not match, or does it all just crash and burn?

I think the problem this time was probably a one-time SNAFU (abbreviation for Situation Normal, All F--d Up, a popular WWII US Army slogan); we have two companies having to coordinate updates together, and this time it happened right around the holidays, probably making it even more of a challenge.

I don't expect we'll have this dilemma again; but it's a good reminder for anyone that, to use another popular American slogan, "if it ain't broke, don't fix it" -- upgrade carefully, and gather the info for a bit before you make the plunge. :)

reading this post : http://forum.ableton.com/viewtopic.php?f=1&t=132874 ... I'm not sure it is safe to upgrade.

8.1.1 and 5.1.1 are probably compatible, but 8.1.1 seems to be bad. so safeness is relative, in that case.

Emmanuel, where could I find the changelog of 5.1.1 ? I just would like to know if I upgrade now or not...

all the best