I believe this has to do with a template I use but here is what is happening:
What does happen when you activate the plugins?
upon activation other plugins that I have they not working for example I built a form with formidable plugin and when I activate any of your plugin the form becomes static I can enter any information... and this is happens mostly when I am trying to activate membership plugin.
Did you try deactivating other plugins installed on your site to check for conflicts?
I did deactivate all the plugins one by one but couldn't find any that would cause the problem
Are you seeing any errors?