Within a day of installing update KB2592687, I had reports of context menus appearing for a fraction of a second then disappearing on RemoteApp session with Office 2010 applications, including Outlook, OneNote, and Word. On most clients, this problem was not observed at the beginning of a session. The delay varied from minutes to hours. Based on internet searching, this appeared to be an office plug-in or install corruption issue. After repairing Office, modifying registeries, reinstalling Office, and deleting user profiles, I tried removing the KB2592687 update, which only seemed related to the problem because of when it was installed. Removing KB2592687 appears to fix the problem, based on the last 24 hours. No one else seems to be having this problem, or they haven't discovered this new cause.
Server: Win 2008 R2; Office 2010 x64
Clients: Win 7
All computers have the latest Microsoft updates via WSUS.