MS测试项目受源控制时更改后的测试不一致？

I have noticed that if I have a set of regression tests and decide to change a property on one of my objects (DTO) from int to decimal for example - i make all the other changes and the tests pass like normal. But if this project is under source control (VSS specifically) this small change will cause something strange to happen...I have noticed that if I have a set of regressi