Plugins not Activating

Recently I’ve been trying to add new plugins, but they don’t activate.

I’ve tried with a number of new ones, all with the same result.

When i click ‘activate’, the page loads and shows the typical ‘Plugin activated’ text.

But the plugin still shows as ‘inactive’ and I cannot use it.

Any ideas?

Thanks

ps: Similarly, I cannot seem to deactivate any plugins that were already active prior to this problem either.

-Vish.