Look at the HELP topics in WinISD under entering new driver data. There is a specific order in which all the T/S parameters have to be entered in order for everything to calculate correctly. Follow that and you'll be golden with most drivers. The only ones I've not been able to enter following the provided directions were cheap or sketchy ones that had provided T/S specs that must have plain and simply been wrong. Also, watch out on the units, such as square centimeters vs. square millimeters for the Sd (cone area) as an example. If the default measurement unit doesn't match the manufacturers specs just click on the unit itself and it will cycle through the different available units for that parameter. Like anything else, it will take a few trips through the software to get used to how it works. As for M5, yeah he may come off a little prickish but that doesn't make anything he's been trying to get across to you any less correct. Have fun with it and when you're really ready to listen and learn we'll still be here to help.