I have the same issue, but only in the remote installation (the production one, obviously…).
When I try to activate the plugin (v.3.2.7), I get a blank page and the activation stops on the address https://mysite.com/wp-admin/plugins.php?activate=true&plugin_status=all&paged=1&s=
On the local installation (same wp core, same database…) it is working well.
Local server: windows7, Apache 2.4.4, PHP 5.4.15, MySQL 5.5.31
Remote server: ubuntu, PHP 5.5.9-1ubuntu4.9, MySQL 5.5.43.
I tried to enable WP_DEBUG, but I see nothing but just a blank page.
On the firebug console i get
The character encoding of the HTML document was not declared. The document will render with garbled text in some browser configurations if the document contains characters from outside the US-ASCII range. The character encoding of the page must be declared in the document or in the transfer protocol.” @ plugins.php
Thank you
Carlo