OK, thanks for the fast reply, I know you're very busy and you don't have much time to spare. The 1v44 is OK for what I need at the present time. However, another problem I've noticed, this time with the WebIDE, is that it hangs after trying to "send to Espruino" a reasonable chunk of code (about 50 lines). Strange. The simple "toggle a led" uploads and works OK.