diff --git a/drivers/is31fl3731/is31fl3731.cpp b/drivers/is31fl3731/is31fl3731.cpp
index 2980193ef..b00fdb168 100644
--- a/drivers/is31fl3731/is31fl3731.cpp
+++ b/drivers/is31fl3731/is31fl3731.cpp
@@ -59,16 +59,18 @@ namespace pimoroni {
     gpio_set_function(sda, GPIO_FUNC_I2C); gpio_pull_up(sda);
     gpio_set_function(scl, GPIO_FUNC_I2C); gpio_pull_up(scl);
 
-    i2c_reg_write_uint8(reg::SHUTDOWN, 0b00000001);
-
     i2c_reg_write_uint8(reg::BANK, CONFIG_BANK);
+    i2c_reg_write_uint8(reg::SHUTDOWN, 0b00000000);
+
+    clear();
+    update(0);
+
+    i2c_reg_write_uint8(reg::SHUTDOWN, 0b00000001);    
 
     i2c_reg_write_uint8(reg::MODE, mode::PICTURE);
 
     i2c_reg_write_uint8(reg::AUDIOSYNC, 0);
 
-    clear();
-
     return true;
   }
 
diff --git a/libraries/breakout_matrix11x7/breakout_matrix11x7.hpp b/libraries/breakout_matrix11x7/breakout_matrix11x7.hpp
index c78eaf4f7..c8de1c3a7 100644
--- a/libraries/breakout_matrix11x7/breakout_matrix11x7.hpp
+++ b/libraries/breakout_matrix11x7/breakout_matrix11x7.hpp
@@ -22,7 +22,7 @@ namespace pimoroni {
         uint8_t lookup_pixel(uint8_t index);
 
         // This wonderful lookup table maps the LEDs on Matrix 11x7
-        const int8_t lookup_table[WIDTH * HEIGHT] = {
+        const uint8_t lookup_table[WIDTH * HEIGHT] = {
             6, 22, 38, 54, 70, 86, 14, 30, 46, 62, 78,
             5, 21, 37, 53, 69, 85, 13, 29, 45, 61, 77,
             4, 20, 36, 52, 68, 84, 12, 28, 44, 60, 76,