Servoy 6.1 rc 4

We noticed that in RC4 that changing the active solution takes quite a long time. The build process is also slower compared to 6.0.6 (and even some of the prior RCs). The worst part however is that after changing the active solution and waiting for the build to finish, when we start a debug session we get all kinds of unexpected runtime errors like “variable is not defined” or “method is not defined” which go away if we restart the Servoy Developer. What could be causing this?