Recently Installed the latest update and it doesn't seem to be working too well. 
Installing the update failed on first attempt (no usb hub)
Trying to roll back to 5.1.3 caused my entire system to slow up and caused conflicts with my sound card
Virus control center no longer works under either firmware version
Secondary Mod Matrix assignments do not work (e.g.: Env3 -> Lfo1 Assign Amount -> Patch Volume, Env3 has no effect on the onset of LFO1 via long attack of Env3)
If anyone has any suggestions please advise
Haven't noticed any other issues but will update this thread more.
Info:
Virus TI 1
Ableton 9.7
OSX 10.11.3