--- htk_3.4.2/HTKLib/HAdapt.c	2009-11-22 11:57:21.461000000 +0000
+++ htk_3.4.1/HTKLib/HAdapt.c	2009-03-12 18:41:39.000000000 +0000
@@ -97,7 +97,6 @@
    int     baseclass;
    DVector bVector;
    TriMat  *bTriMat;
-   Boolean resetbTriMat;
    struct _AccCache *next;
 } AccCache;                       /* acc cache to save accumulators related to parent XForm */  
 
@@ -1037,7 +1036,8 @@
 
    paac = GetPAAccCache(mp);    
    if ( paac != NULL ) {
-      if ( paac->resetbTriMat ) {
+      /* This needs to be altered so that it does not rely on a non-zero first element */
+      if ( paac->bTriMat[1][1][1] == 0 ) {
 	nblock = (int)(paac->bTriMat[0]);
 	for (bl=1,bstart=0;bl<=nblock;bl++) {
 	  m = paac->bTriMat[bl];
@@ -1048,7 +1048,6 @@
 	  }
 	  bstart += bsize;
 	}
-	paac->resetbTriMat=FALSE;
       }
       covar = mp->cov.var;
       for (i=1;i<=vsize;i++) {
@@ -1159,7 +1158,6 @@
       for (ac = headac; ac!= NULL; ac=ac->next) {
         ZeroDVector(ac->bVector);
         ZeroBlockTriMat(ac->bTriMat);
-	ac->resetbTriMat=TRUE;
       }
    }
 }
@@ -1913,7 +1911,6 @@
    ZeroDVector(ac->bVector);
    ac->bTriMat = CreateBlockTriMat(&acccaStack,size);
    ZeroBlockTriMat(ac->bTriMat);
-   ac->resetbTriMat=TRUE;
    ac->next = headac;
    headac = ac;
    return(ac);