Fixed issue #252.

src/renderer_gl.cpp

@@ -4785,11 +4785,12 @@ namespace bgfx
 					&&  0 == draw.m_instanceDataOffset)
 					{
 						if (programChanged
-						||  currentState.m_vertexBuffer.idx != draw.m_vertexBuffer.idx
-						||  currentState.m_indexBuffer.idx != draw.m_indexBuffer.idx
-						||  currentState.m_instanceDataBuffer.idx != draw.m_instanceDataBuffer.idx
+						||  baseVertex                        != draw.m_startVertex
+						||  currentState.m_vertexBuffer.idx   != draw.m_vertexBuffer.idx
+						||  currentState.m_indexBuffer.idx    != draw.m_indexBuffer.idx
 						||  currentState.m_instanceDataOffset != draw.m_instanceDataOffset
-						||  currentState.m_instanceDataStride != draw.m_instanceDataStride)
+						||  currentState.m_instanceDataStride != draw.m_instanceDataStride
+						||  currentState.m_instanceDataBuffer.idx != draw.m_instanceDataBuffer.idx)
 						{
 							bx::HashMurmur2A murmur;
 							murmur.begin();