I recently began using VS2012 for SSRS since the Data Tools update has an addon. I have noticed I can't use my arrow keys to move around inside the Expression Editor textbox. basically the textbox just loses focus and to somewhere else on the screen. VS2008 BIDS didn't have this problem.
Another developer on my team and myself are using VS2012 and we can both reproduce this easily.
Is anyone else having problems using the arrow keys to move around while typing an expression for a Sql Server Reporting Services report in VS 2012? Is there a patch for this?