Try setting up a 15-year 5.5 fixed-rate loan of $193,000. 
LoanDruid shows principal payments of 695.56, 698.75, 701.95
while Quicken and TCF yield :   692.39, 695.57, 698.75, 701.95
Same for the first random amortization tool I googled at http://ray.met.fsu.edu/~bret/amortize.html

The first split between principal and interest is wrong in LoadDruid. I have seen a number of bugs mentioning that this type of one-off issues occurred in the past (see bug 105225), but since the problem still exists and essentially makes this feature unusable I thought I would file a bug report.

Note that this loan amount/rate would break LoanDruid anyway as banks round up to one cent above what is predicted ans scheduled. It would be a better idea to let the user enter the monthly payment to avoid mismatches between the bank and scheduled transactions. This is what Quicken does, they must have a good reason for it :-)