Transform 2D center was using short. Not good enough when it's it's way off screen. Switched to ints, that fixed the bug in the tracker.

Switching to floats would probably be safer in the long term, but too many things to test to do that now.

source/blender/src/transform_generics.c

@@ -608,10 +608,10 @@ void calculateCenterCursor(TransInfo *t)
 		
 		VECCOPY(vec, t->center);
 		Mat4MulVecfl(ob->obmat, vec);
-		project_short_noclip(vec, t->center2d);
+		project_int(vec, t->center2d);
 	}
 	else {
-		project_short_noclip(t->center, t->center2d);
+		project_int(t->center, t->center2d);
 	}
 }
 
@@ -640,10 +640,10 @@ void calculateCenterMedian(TransInfo *t)
 		
 		VECCOPY(vec, t->center);
 		Mat4MulVecfl(ob->obmat, vec);
-		project_short_noclip(vec, t->center2d);
+		project_int(vec, t->center2d);
 	}
 	else {
-		project_short_noclip(t->center, t->center2d);
+		project_int(t->center, t->center2d);
 	}
 }
 
@@ -679,10 +679,10 @@ void calculateCenterBound(TransInfo *t)
 		
 		VECCOPY(vec, t->center);
 		Mat4MulVecfl(ob->obmat, vec);
-		project_short_noclip(vec, t->center2d);
+		project_int(vec, t->center2d);
 	}
 	else {
-		project_short_noclip(t->center, t->center2d);
+		project_int(t->center, t->center2d);
 	}
 }
 
@@ -709,7 +709,7 @@ void calculateCenter(TransInfo *t)
 			Object *ob= OBACT;
 			if(ob) {
 				VECCOPY(t->center, ob->obmat[3]);
-				project_short_noclip(t->center, t->center2d);
+				project_int(t->center, t->center2d);
 			}
 		}
 		
@@ -735,7 +735,7 @@ void calculateCenter(TransInfo *t)
 			axis[1]= t->center[1]- 6.0f*axis[1];
 			axis[2]= t->center[2]- 6.0f*axis[2];
 			
-			project_short_noclip(axis, t->center2d);
+			project_int(axis, t->center2d);
 			
 			/* rotate only needs correct 2d center, grab needs initgrabz() value */
 			if(t->mode==TFM_TRANSLATION) VECCOPY(t->center, axis);