diff --git a/Outputs/CRT/Internals/CRTConstants.hpp b/Outputs/CRT/Internals/CRTConstants.hpp
index da9484fd9..9180d3c32 100644
--- a/Outputs/CRT/Internals/CRTConstants.hpp
+++ b/Outputs/CRT/Internals/CRTConstants.hpp
@@ -40,8 +40,8 @@ const GLsizei IntermediateBufferWidth = 2048;
 const GLsizei IntermediateBufferHeight = 512;
 
 // Some internal buffer sizes
-const GLsizeiptr OutputVertexBufferDataSize = 44928;	// a multiple of 6 * OutputVertexSize
-const GLsizeiptr SourceVertexBufferDataSize = 29952;	// a multiple of 2 * SourceVertexSize
+const GLsizeiptr OutputVertexBufferDataSize = 6 * 8 * 312 * 10;		// a multiple of 6 * OutputVertexSize
+const GLsizeiptr SourceVertexBufferDataSize = 2 * 16 * 312 * 10;	// a multiple of 2 * SourceVertexSize
 
 }
 }
diff --git a/Outputs/CRT/Internals/CRTInputBufferBuilder.cpp b/Outputs/CRT/Internals/CRTInputBufferBuilder.cpp
index 22c10030f..7bb835127 100644
--- a/Outputs/CRT/Internals/CRTInputBufferBuilder.cpp
+++ b/Outputs/CRT/Internals/CRTInputBufferBuilder.cpp
@@ -49,16 +49,25 @@ void CRTInputBufferBuilder::allocate_write_area(size_t required_length)
 
 void CRTInputBufferBuilder::release_write_pointer()
 {
-	if(_should_reset)
-	{
-		_next_write_x_position = _next_write_y_position = 0;
-	}
+//	if(_should_reset)
+//	{
+//		_next_write_x_position = _next_write_y_position = 0;
+//	}
 }
 
 bool CRTInputBufferBuilder::reduce_previous_allocation_to(size_t actual_length)
 {
 	if(_next_write_y_position == InputBufferBuilderHeight) return false;
 
+	// correct if the writing cursor was reset while a client was writing
+	if(_next_write_x_position == 0 && _next_write_y_position == 0 && _write_target_pointer != 1)
+	{
+		memmove(&_image[1], &_image[_write_target_pointer], actual_length);
+		_write_target_pointer = 1;
+		_last_allocation_amount = actual_length;
+		_next_write_x_position = (uint16_t)(actual_length + 2);
+	}
+
 	// book end the allocation with duplicates of the first and last pixel, to protect
 	// against rounding errors when this run is drawn
 	memcpy(	&_image[(_write_target_pointer - 1) * _bytes_per_pixel],
@@ -82,9 +91,8 @@ uint8_t *CRTInputBufferBuilder::get_image_pointer()
 
 uint16_t CRTInputBufferBuilder::get_and_finalise_current_line()
 {
-	// TODO: we may have a vended allocate_write_area in play that'll be lost by this step; fix.
 	uint16_t result = _write_y_position + (_next_write_x_position ? 1 : 0);
-	_should_reset = (_next_write_y_position == InputBufferBuilderHeight);
+	_next_write_x_position = _next_write_y_position = 0;
 	return result;
 }
 
diff --git a/Outputs/CRT/Internals/CRTOpenGL.cpp b/Outputs/CRT/Internals/CRTOpenGL.cpp
index ed6a20478..cfac44ba2 100644
--- a/Outputs/CRT/Internals/CRTOpenGL.cpp
+++ b/Outputs/CRT/Internals/CRTOpenGL.cpp
@@ -185,7 +185,7 @@ void OpenGLOutputBuilder::draw_frame(unsigned int output_width, unsigned int out
 	int number_of_clearing_zones		= getCircularRanges(_cleared_composite_output_y, _composite_src_output_y, IntermediateBufferHeight, 1, clearing_zones);
 	int number_of_source_drawing_zones	= getCircularRanges(_drawn_source_buffer_data_pointer, _source_buffer_data_pointer, SourceVertexBufferDataSize, 2*SourceVertexSize, source_drawing_zones);
 	int number_of_output_drawing_zones	= getCircularRanges(_drawn_output_buffer_data_pointer, _output_buffer_data_pointer, OutputVertexBufferDataSize, 6*OutputVertexSize, output_drawing_zones);
-	uint16_t completed_texture_y = _buffer_builder->get_and_finalise_current_line();
+	uint16_t completed_texture_y		= _buffer_builder->get_and_finalise_current_line();
 
 	_composite_src_output_y %= IntermediateBufferHeight;
 	_source_buffer_data_pointer %= SourceVertexBufferDataSize;