Why does Visual Studio 2010's C# debugger continue instead of stepping over? [duplicate]

Question

Possible Duplicate:
Visual Studio 2010 debugger skipping

If I break at a breakpoint in visual studio (C#), I can step over statements quite happily. Occasionally though, it ignores the step over and it's as though I'd hit continue instead.

It is not repeatable.. immediately re-running and breaking on the same point and stepping over will sometimes work fine, or will fail to step over on a different statement.

It may be my imagination, but the faster I step over things, the more reliable it seems. As though it's timing out on something.

My app is a single-threaded app debugging a method via MSTest.

Update

It seems to be more repeatable if I inspect things in the debugger, e.g. expand the 'this' reference in the locals window. It's not 100% repeatable though.

Answer 1

This is a known problem, it seems to strike particularly often in a unit test scenario. The bug has been identified by the Debugger team as of October 1st, getting it to your machine is what tends to take a while. The feedback article is here, vote it up and keep an eye on it. If this will be a hotfix instead of rolled into the next service pack then it will be published here.

UPDATE: this was a regression from VS2008, a post-SP1 hotfix repaired it but the hotfix updates didn't make it into the VS2010 code base. It was again fixed in VS2010 SP1.