diff -urN 11-STYMulator-0.21a_protect_loopframe/src/stsoundlib/Ymload.cpp 12-STYMulator-0.21a_load_errors/src/stsoundlib/Ymload.cpp
--- 11-STYMulator-0.21a_protect_loopframe/src/stsoundlib/Ymload.cpp	2010-04-21 23:36:06.479198054 +0200
+++ 12-STYMulator-0.21a_load_errors/src/stsoundlib/Ymload.cpp	2010-04-21 23:41:33.307194724 +0200
@@ -276,7 +276,7 @@
 			case 0x594d3362 /*'YM3b'*/:		// Standart YM-Atari format + Loop info.
 				pUD = (ymu8*)(pBigMalloc+fileSize-4);
 				songType = YM_V3;
-				nbFrame = (fileSize-4)/14;
+				nbFrame = (fileSize-8)/14;
 				loopFrame = ReadLittleEndian32(pUD);
 				ymChip.setClock(ATARI_CLOCK);
 				setPlayerRate(50);