@Sujendra
On the terrain edition panel, look at the picture in the top left corner. Now click its edges (notice the blue bar on hover?)
@Molunbun
Thank you for the report. Unfortunately crashes caused by in-game reloads are a civ5 bug, not an IGE bug. it can actually appear with any mod: everything was fine, then you add a mod and, bam!, you can no longer reload in game. Nothing we, modders, can do about it.
It can be fixed by removing mods, probably specifically the mod that drove civ5 crazy. You may also want to try things like deleting every mod, cache folder and installs folder, then re-download everything. And do not forget to spam 2k games with crash reports because I am more than pissed off with this bug. ^^
PS: That being said, could you run tests and confirm that this actually has nothing to do with "glance at map" please? If I am wrong and you're correct, than could you please test whether:
a) The problem persists if you close civ5, load a game where you did use glance at map but no longer use it?
b) What about the two buttons on the "player" panel? Explore and reveal? Do they also each trigger the crash?