Are There Known Incompatibility Issues with Other Plugins

Hello,

We have Post Indexer and Comment Indexer installed and working.

I installed the user reports plugin and it activated fine.

I installed User activity and after activation no new menu option appears in network admin menu.

Uninstalled, deactivated our existing plugin ThreeWP Activity Monitor reinstalled and reactivated, but still no menu option in network admin area.

Just wondering if there is an obvious or known plugin conflict to look for before we spend time looking for the problem.

Thanks,

Phil D