Everytime that I open a class diagram, I get exceptions from R#. See tracker number 24231 for an example. This causes R# to have various problems untill VS2005 is closed and the cache files removed. The probelm is much worse in 238 - to the point of rendering VS2005 unusable. Just restarting - even with the class diagram closed - causes numerous exceptions to be throwm - see exceptions that I logged yesterday for details.
Also note the 238 has so bad preformance issues after about 1/2 hour of work. The screen starts to blink and it takes up to 20 seconds for keystrokes to be registered. Several people here have seen this on different machines.