sublimity-map does not work with ESS

[r2evans]

I don't know how best to troubleshoot this, but when working in ESS[S] mode, sublimity does not function (also discussed at ESS, emacs-ess/ESS#346). When enabled, non-ESS buffers seem to work alright.

Minor modes enabled:

Enabled minor modes: Async-Bytecomp-Package Auto-Composition
Auto-Compression Auto-Encryption Auto-Revert Blink-Cursor
Column-Number Diff-Auto-Refine Eldoc Electric-Indent Ess-Roxy
File-Name-Shadow Font-Lock Git-Gutter Global-Font-Lock
Global-Git-Commit Global-Git-Gutter Global-Subword Line-Number
Magit-Auto-Revert Mouse-Wheel Shell-Dirtrack Show-Paren Smartscan
Subword Tooltip Transient-Mark Which-Function Window-Numbering

(When testing previously, the majority of these minor modes were not in play. I don't know what minor modes @vspinu had in play when he found the same problem. Because of this, I'm not certain it's just the major mode impacting sublimity's performance.)

What can I do (hooks, etc) to figure out what is disabling the map when in ESS mode?