Map Editor and ICE in 3.0

[wulfir]

I saw the thick ice, then I made a regular water hex in it,

Ok, but then you did not have terrain type set to winter and month set to January - did you use terrain type summer?

when I went to replace that with witer olevel terrain to get thick ice,

FYI, there is a special button for thick ice. Adding 0 level clear terrain is adding 0 level clear terrain.

But you don't really need to bother with thick ice.

If you are trying to create a winter map with frozen lakes etc it would be OK to use clear terrain for lakes, fields, marshes..., the frozen parts of rivers. The snow will settle on it all and it looks white. Everywhere.
Easy, no headache - if you want it to look fancy make the clear terrain/snowdrifts representating ice level 0 and the clear terrain/snowdrifts representing ground level 10 and higher.