Did [we] ever find out want went down between martian manhunter and the rest of justice league when he was a member?
For those who don’t know, I assume /u/Nightangale is referring to the panel from Justice League #8 that references, as a single splash page, that it “didn’t go well” when Martian Manhunter and the Justice League worked together:
Short answer: Nope.
Long answer: No and at this point it’s pretty unlikely we ever will.
That panel, while awesome, was during the tumultuous start of the New 52 – the same era that saw references to Teen Titans that later were said to never exist, contradicting info about Tim Drake’s codename etc and the rest. By this I mean that the Martian Manhunter’s background was a little sketchy in the first year, especially regarding his history with the Justice League, Storm Watch etc.
At this point I don’t think there’s any chance we’ll ever get an explanation and all these inconsistencies seem to be just being hand waved away. Frustrating, I guess, but at least we got this awesome panel out of it! :)