According to mlox, the functioning of the Madd Leveler mod can be broken by using MCP's Restore/Drain Attribute fix. It provided a link, but only to a post stating that this was the case, not why it was the case.

The only information I could find was someone who used the uncapping function running into something that damaged his attributes, which I believe is exactly what MCP's fix was designed to address.

Can someone confirm if that's the problem or not? I don't plan on letting attributes or skills go over 100, but if the Madd Leveler tries to fix the vanilla bug its own way then I'll just leave the MCP option off. Otherwise, can anyone highlight the problem area of Madd Leveler's script and maybe how to fix it without breaking the mod?