Hi all,
I noticed a strange bug just now: the offline reference pages don't seem to want to work with Chromium. If you click Help > Reference nothing would happen. I switched my system default to use Firefox and that started to work.
My system is Linux Mint 17.2 Cinnamon 64-bit running on a year-old Dell Inspiron.
IDE version is 1.6.6 downloaded from the website today (I had 1.1.0 or whatever is in the apt repository for awhile, it didn't work either)
For a minute I thought it didn't work at all, but I found it's more specific than that.
Thanks and happy making!