diff --git a/drivers/gles3/storage/material_storage.cpp b/drivers/gles3/storage/material_storage.cpp
index bacf607c668..21790d29b5d 100644
--- a/drivers/gles3/storage/material_storage.cpp
+++ b/drivers/gles3/storage/material_storage.cpp
@@ -1111,15 +1111,15 @@ MaterialStorage::MaterialStorage() {
 
 	global_shader_uniforms.buffer_size = MAX(16, (int)GLOBAL_GET("rendering/limits/global_shader_variables/buffer_size"));
 	if (global_shader_uniforms.buffer_size * sizeof(GlobalShaderUniforms::Value) > uint32_t(Config::get_singleton()->max_uniform_buffer_size)) {
+		// Limit to maximum support UBO size.
 		global_shader_uniforms.buffer_size = uint32_t(Config::get_singleton()->max_uniform_buffer_size) / sizeof(GlobalShaderUniforms::Value);
-		WARN_PRINT("Project setting \"rendering/limits/global_shader_variables/buffer_size\" exceeds maximum uniform buffer size of: " + itos(Config::get_singleton()->max_uniform_buffer_size / sizeof(GlobalShaderUniforms::Value)) + ". Falling back on maximum buffer size.");
 	}
 
 	global_shader_uniforms.buffer_values = memnew_arr(GlobalShaderUniforms::Value, global_shader_uniforms.buffer_size);
 	memset(global_shader_uniforms.buffer_values, 0, sizeof(GlobalShaderUniforms::Value) * global_shader_uniforms.buffer_size);
 	global_shader_uniforms.buffer_usage = memnew_arr(GlobalShaderUniforms::ValueUsage, global_shader_uniforms.buffer_size);
-	global_shader_uniforms.buffer_dirty_regions = memnew_arr(bool, global_shader_uniforms.buffer_size / GlobalShaderUniforms::BUFFER_DIRTY_REGION_SIZE);
-	memset(global_shader_uniforms.buffer_dirty_regions, 0, sizeof(bool) * global_shader_uniforms.buffer_size / GlobalShaderUniforms::BUFFER_DIRTY_REGION_SIZE);
+	global_shader_uniforms.buffer_dirty_regions = memnew_arr(bool, 1 + (global_shader_uniforms.buffer_size / GlobalShaderUniforms::BUFFER_DIRTY_REGION_SIZE));
+	memset(global_shader_uniforms.buffer_dirty_regions, 0, sizeof(bool) * (1 + (global_shader_uniforms.buffer_size / GlobalShaderUniforms::BUFFER_DIRTY_REGION_SIZE)));
 	glGenBuffers(1, &global_shader_uniforms.buffer);
 	glBindBuffer(GL_UNIFORM_BUFFER, global_shader_uniforms.buffer);
 	glBufferData(GL_UNIFORM_BUFFER, sizeof(GlobalShaderUniforms::Value) * global_shader_uniforms.buffer_size, nullptr, GL_DYNAMIC_DRAW);
@@ -1788,7 +1788,7 @@ void MaterialStorage::global_shader_parameter_add(const StringName &p_name, RS::
 
 		//is vector, allocate in buffer and update index
 		gv.buffer_index = _global_shader_uniform_allocate(gv.buffer_elements);
-		ERR_FAIL_COND_MSG(gv.buffer_index < 0, vformat("Failed allocating global variable '%s' out of buffer memory. Consider increasing it in the Project Settings.", String(p_name)));
+		ERR_FAIL_COND_MSG(gv.buffer_index < 0, vformat("Failed allocating global variable '%s' out of buffer memory. Consider increasing rendering/limits/global_shader_variables/buffer_size in the Project Settings. Maximum items supported by this hardware is: %d.", String(p_name), Config::get_singleton()->max_uniform_buffer_size / sizeof(GlobalShaderUniforms::Value)));
 		global_shader_uniforms.buffer_usage[gv.buffer_index].elements = gv.buffer_elements;
 		_global_shader_uniform_store_in_buffer(gv.buffer_index, gv.type, gv.value);
 		_global_shader_uniform_mark_buffer_dirty(gv.buffer_index, gv.buffer_elements);
@@ -1999,7 +1999,7 @@ int32_t MaterialStorage::global_shader_parameters_instance_allocate(RID p_instan
 	ERR_FAIL_COND_V(global_shader_uniforms.instance_buffer_pos.has(p_instance), -1);
 	int32_t pos = _global_shader_uniform_allocate(ShaderLanguage::MAX_INSTANCE_UNIFORM_INDICES);
 	global_shader_uniforms.instance_buffer_pos[p_instance] = pos; //save anyway
-	ERR_FAIL_COND_V_MSG(pos < 0, -1, "Too many instances using shader instance variables. Increase buffer size in Project Settings.");
+	ERR_FAIL_COND_V_MSG(pos < 0, -1, vformat("Too many instances using shader instance variables. Consider increasing rendering/limits/global_shader_variables/buffer_size in the Project Settings. Maximum items supported by this hardware is: %d.", Config::get_singleton()->max_uniform_buffer_size / sizeof(GlobalShaderUniforms::Value)));
 	global_shader_uniforms.buffer_usage[pos].elements = ShaderLanguage::MAX_INSTANCE_UNIFORM_INDICES;
 	return pos;
 }
@@ -2079,7 +2079,7 @@ void MaterialStorage::global_shader_parameters_instance_update(RID p_instance, i
 void MaterialStorage::_update_global_shader_uniforms() {
 	MaterialStorage *material_storage = MaterialStorage::get_singleton();
 	if (global_shader_uniforms.buffer_dirty_region_count > 0) {
-		uint32_t total_regions = global_shader_uniforms.buffer_size / GlobalShaderUniforms::BUFFER_DIRTY_REGION_SIZE;
+		uint32_t total_regions = 1 + (global_shader_uniforms.buffer_size / GlobalShaderUniforms::BUFFER_DIRTY_REGION_SIZE);
 		if (total_regions / global_shader_uniforms.buffer_dirty_region_count <= 4) {
 			// 25% of regions dirty, just update all buffer
 			glBindBuffer(GL_UNIFORM_BUFFER, global_shader_uniforms.buffer);
diff --git a/servers/rendering/renderer_rd/storage_rd/material_storage.cpp b/servers/rendering/renderer_rd/storage_rd/material_storage.cpp
index d1c8c71b7f8..13b00be1c43 100644
--- a/servers/rendering/renderer_rd/storage_rd/material_storage.cpp
+++ b/servers/rendering/renderer_rd/storage_rd/material_storage.cpp
@@ -1165,8 +1165,8 @@ MaterialStorage::MaterialStorage() {
 	global_shader_uniforms.buffer_values = memnew_arr(GlobalShaderUniforms::Value, global_shader_uniforms.buffer_size);
 	memset(global_shader_uniforms.buffer_values, 0, sizeof(GlobalShaderUniforms::Value) * global_shader_uniforms.buffer_size);
 	global_shader_uniforms.buffer_usage = memnew_arr(GlobalShaderUniforms::ValueUsage, global_shader_uniforms.buffer_size);
-	global_shader_uniforms.buffer_dirty_regions = memnew_arr(bool, global_shader_uniforms.buffer_size / GlobalShaderUniforms::BUFFER_DIRTY_REGION_SIZE);
-	memset(global_shader_uniforms.buffer_dirty_regions, 0, sizeof(bool) * global_shader_uniforms.buffer_size / GlobalShaderUniforms::BUFFER_DIRTY_REGION_SIZE);
+	global_shader_uniforms.buffer_dirty_regions = memnew_arr(bool, 1 + (global_shader_uniforms.buffer_size / GlobalShaderUniforms::BUFFER_DIRTY_REGION_SIZE));
+	memset(global_shader_uniforms.buffer_dirty_regions, 0, sizeof(bool) * (1 + (global_shader_uniforms.buffer_size / GlobalShaderUniforms::BUFFER_DIRTY_REGION_SIZE)));
 	global_shader_uniforms.buffer = RD::get_singleton()->storage_buffer_create(sizeof(GlobalShaderUniforms::Value) * global_shader_uniforms.buffer_size);
 }
 
@@ -1769,7 +1769,7 @@ void MaterialStorage::global_shader_parameters_instance_update(RID p_instance, i
 void MaterialStorage::_update_global_shader_uniforms() {
 	MaterialStorage *material_storage = MaterialStorage::get_singleton();
 	if (global_shader_uniforms.buffer_dirty_region_count > 0) {
-		uint32_t total_regions = global_shader_uniforms.buffer_size / GlobalShaderUniforms::BUFFER_DIRTY_REGION_SIZE;
+		uint32_t total_regions = 1 + (global_shader_uniforms.buffer_size / GlobalShaderUniforms::BUFFER_DIRTY_REGION_SIZE);
 		if (total_regions / global_shader_uniforms.buffer_dirty_region_count <= 4) {
 			// 25% of regions dirty, just update all buffer
 			RD::get_singleton()->buffer_update(global_shader_uniforms.buffer, 0, sizeof(GlobalShaderUniforms::Value) * global_shader_uniforms.buffer_size, global_shader_uniforms.buffer_values);