Hi, I have been using my MacBook Pro on since the end of 2010 and Have been using Windows XP Pro. I have had no problems with it until Toolkit 1.13.0 and eDLT. I load it, OK, I modify it and save to the eDLT, OK. I reopen it to make changes and Toolkit crashes and it uses all the resources on the Chip. I close Toolkit via Task Manager and then restart toolkit and I can then open it again; and thus the circle of discontent is established. C-Bus Help says that it is a problem caused by Parallels and that they only use Windows 7 64bit and have no problems. So I loaded it on on a 32bit Windows 7 machine and started all over again - with exactly the same results! Is it that they are using a CNI interface and I'm using a serial interface (or PACA as an interface) and the USB Driver is the problem? There are other issues but I'll have to start a new thread for that. Has anyone else experience the same and resolved it?