Can I use Oscuro's Oblivion Overhaul with Martigen's Monster Mod? Are there any compatibility issues?

Thanks

I know past versions of MMM were compatible with OOO but I have not used mods in a long time. From what I remember if it is compatible then MMM should have some OOO esp files with it to be used alongside MMM.

I just started using OOO again today but its an older version 1.34 beta 5.

Open the readme and you will find what you are looking for. Anyway MMM and OOO are compatible,and both are the core for a Fcom installation.