The current set of WaveToy examples in CactusWave do no have a
SYNC statement in their
schedule.ccl in when scheduling the Boundaries routines. This can cause problems with b/c that expect ghost zones to be valid.
Pull request https://bitbucket.org/cactuscode/cactuswave/pull-requests/1/wavetoyc-sync-when-selecting-bcs-run-bcs/diff adds the SYNC call to WaveToyC and a similar change should be made to all WaveToy examples.