Joomla 3.4 has a nice feature of frontend editing for Joomla Modules. Just tried it and it works wonders. But for them, who doesnt want to do that, and dont need the edit icon to keep on showing near each module, then there is a way to fix it.
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Many users have reported this issue on various Joomla forums that they are not abe to save module configuration pages after making some edits. This is mainly happening with module and plugin parameter pages too.
After checking and digging the issue, we found out the fix for it.
One of our client website was running Joomla 3.2. We just upgraded it to 3.2.1 and the whole frontend and backend has gone black with an error message,
Since Joomla 3.2.1 release, there is a new feature called "INSTALL FROM WEB".
In short, they call it "JOOMLA APPSTORE". Now you can see the complete Joomla Extensions Directory within your Joomla website and download, whichever you need right from there.