Trouble with Suspension Analyzer

[GT408]

Hey everyone, I'm having some difficulty figuring out what I'm not doing correctly in Performance Trends Suspension Analyzer program. I've been playing around in the free download software in an attempt to design custom suspension for my 66 Mustang. The plan is a coilover front end with a 3-link and Panhard in the rear. I got the front end close to what I think will be a good setup (I'll post the results for your review and critique in another thread), but when designing the 3-link rear, somehow it kicks out a calculation of the roll center height being -422.7. No matter what I input values I change it never deviates. I'm posting screen shots of all the rear end values and hoping someone knows what I've done wrong. This is the first time I've tried posting pictures so bear with me. If they're too unclear or not large enough to read, I've attached a PDF of all the values. Thanks in advance!

Justin