Here’s a odd new one: in the control panel under the Design tab, the labels are incorrect for many of the UI elements, from headers to buttons. For example, the following changes are appearing:
Template Management > template_management
New Group > new_template_group
Delete Group > delete_template_group
Edit Group > edit_template_group
Template Group Name: site > name_of_template_group: site
..etc.
This seems to be isolated to only the Design tab of this install:
EE Version 2.1.0 build 20100810
Microsoft-IIS/7.0
MySQL client version: mysqlnd 5.0.7-dev - 091210 - $Revision: 294543
PHP 5.3.2