Kernel.MessageBox (Windows) returned back. This problem will be solved in versions 1.9/2.0.

BlackBox/_Windows_GUI/build.bat

@@ -1,6 +1,6 @@
 @echo off
 @echo DevCompiler.CompileSubs Com Comm Ctl Dev Form Host Obx Ole Sql Std System Text Win Xhtml Cons >> tmp.txt
-@echo DevLinker.Link BlackBox.exe := Kernel$+ Files HostEnv HostFiles StdLoader 1 BlackBox.res 1 Applogo.ico 2 Doclogo.ico 3 SFLogo.ico 4 CFLogo.ico 5 DtyLogo.ico 6 folderimg.ico 7 openimg.ico 8 leafimg.ico 1 Move.cur 2 Copy.cur 3 Link.cur 4 Pick.cur 5 Stop.cur 6 Hand.cur 7 Table.cur >> tmp.txt
+@echo DevLinker.Link BlackBox.exe := Kernel$+ Files HostEnv HostFiles HostGui StdLoader 1 BlackBox.res 1 Applogo.ico 2 Doclogo.ico 3 SFLogo.ico 4 CFLogo.ico 5 DtyLogo.ico 6 folderimg.ico 7 openimg.ico 8 leafimg.ico 1 Move.cur 2 Copy.cur 3 Link.cur 4 Pick.cur 5 Stop.cur 6 Hand.cur 7 Table.cur >> tmp.txt
 @echo Kernel.Quit(0) >> tmp.txt
 dev0.exe /BB_PACKED_FIRST < tmp.txt
 del tmp.txt