fixes #737 -- better locking/recovery of run button
fixes #737 -- better locking/recovery of run button

eohomegrownapps/musicblocks,Hrishi1999/musicblocks,Hrishi1999/musicblocks,walterbender/musicblocks,walterbender/musicblocks,Hrishi1999/musicblocks,eohomegrownapps/musicblocks,eohomegrownapps/musicblocks,walterbender/musicblocks