hi,
years ago i made a decision to name icons in infinity-mod skin other way than other skinners did,
after a change made after newnigma 4.0.6 to NewNigma2Usage.py, "icon" option is added to choices only when file <path>/icons/beta_g.png is present,
for infinity-mod where icons are named like: ca_b_0.png, ca_b_1.png, ca_b_2.png, etc there is no such file so "icons" are disabled for that skin since that change.

so please fix infinity-mod skin pack by renaming icons to normal names like other skins with ca icons have or create empty file to suffice check eg: touch <path>/icons/beta_g.png

thank you