Patch 1.0.0.621 should make this fix obsolete. This thread should no longer need a sticky and can die a natural death. Spoiler has old information for those that care to view.
Spoiler Original fix :
There is a known issue with custom civilizations not showing up in game or causing a pre-patch modded saved game to crash on load.
In the patch process they changed the games main civ5civilizations.xml file. What they did is they removed an old tag that the original game was not even using. The problem is that if you cut, pasted, and edited an existing civilization you probably left that unsupported tag in. The unsupported tag is also in Kael's Mod Guide. This causes the game to not "see" your new civilization.
Fortunately the fix is really simple. Go into your mod's xml file that contains the custom civ's information and simply remove the line containing the following tag:
More Details Here
Perhaps this might be worth a sticky until the hotfix addresses the issue.
In the patch process they changed the games main civ5civilizations.xml file. What they did is they removed an old tag that the original game was not even using. The problem is that if you cut, pasted, and edited an existing civilization you probably left that unsupported tag in. The unsupported tag is also in Kael's Mod Guide. This causes the game to not "see" your new civilization.
Fortunately the fix is really simple. Go into your mod's xml file that contains the custom civ's information and simply remove the line containing the following tag:
Code:
<Civilopedia>TXT_KEY_CIV5_XXX</Civilopedia>
More Details Here
Perhaps this might be worth a sticky until the hotfix addresses the issue.