Using either VsVim or ViEmu extensions in VS2010:
When initiating a search with '/', when the search lands in a '///' comment block, pressing 'Enter' (to end the search and leave the cursor on the matched word) opens a new line. There is no way to end the search except by pressing 'Esc'. When cancelling the search with 'Esc', the cursor returns to where it was when the search was started.
This happens with ReSharper 5.1.1753.4, and 5.1.1727.12.