WPILib deleting itself (eclipse)

Whenever I deploy my eclipse project, WPILib’s classes.jar deletes itself and I get a bunch of errors. This can be fixed by opening up the WPILib project in netbeans and building it, but this is sort of inconvenient. Anybody else having this problem or have any ideas for fixing it?

Are you using standard settings or did you change sdk/wpilib location preferences?

Our testing up to now has not experienced this issue. The classes.jar file should only be deleted/overwritten when the sdk is installed, which usually only happens once per plug-in update. This can also be triggered by changing the team number, or the plug-ins detecting that the sdk failed to install properly. however, the re-install should complete before the deploy starts.

Can you give more details on your configuration please?