Both are acceptable spellings, but currently both are being used ingame. It's not a big deal but I would guess it was not intended to use two different spellings of the same word.

Currently it is:

"Cause Dissension" in the spy op list

and

"[someone] attempted to cause dissention among your troops!" for news of a failed dissension/dissention op attempt

I can not continue playing until this bug is fixed. This ruins it for me.

(well, fine, just as long as no one CDs me)

actually "dissention" is NOT an acceptable spelling, it's just spelt wrong =/

Apparently your're correct. When merriam-webster said said "dissention" was a "variant" of "dissension" I assumed that meant a valid variant, not a common misspelling.

ttt--still not fixed for failed attempts!

change it to dissect, you dissected xxx enemy troops. :P

or vivisected