That sounds like an environment issue with Visual Studio. That is much more difficult to diagnose. I have never heard of this before which is generally a clue when there is an environmental issue within VS. We actually talk directly to the VS DTE which in turn talks to the VS engine. This is done so that we respect all security and logic within VS such as source control, permissions, etc. Check these types of items:- Source control
- Windows permissions as well as source control permissions if using source control
- Disk space
Things of the above nature would be where you want to look.