Bin file not found - but build.cmd works ok from command line

I just installed Alchitry Labs 1.2.7 on my Windows 11 machine. I have a Cu board and i’m using iCECube2 (with a license file). When I try to build the LEDtoButton example I get the Bin file not found error message. The .\work\alchitry_imp\sbt\outputs\bitmap folder is empty. But when I run build.cmd from the Windows command line it all seems to work fine and the bin file is generated. Any ideas?