i have tried using reis minimap for both 1.8 and 1.7.9 and all it does is crash minecraft.
one instance crashed without saving and caused some huge rectangle voids in the landscape when i finally got the world working again with a different name.
Rei's Minimap hasn't been updated since 1.6.2. So, yes, it's going to make minecraft crash if you're trying to run an outdated mod on an unsupported game version.
i have tried using reis minimap for both 1.8 and 1.7.9 and all it does is crash minecraft.
one instance crashed without saving and caused some huge rectangle voids in the landscape when i finally got the world working again with a different name.