Just got this from Ken at OV.. We have been testing the program in-house, but as yet have received very little feedback on the modeling and Greeks in the Beta version. We have made some changes to some parts of the program to fix some minor issues (but no change to the modeling between this release and the previous Beta version). You can get the new release by downloading and running the installer from this link This will install right over the previous beta version and will not change any settings you have made. When reporting issues related to the modeling/valuation/Greeks we can only fix things if we can recreate them here. Helpful information for doing so would be sending us the files that you are using, which can be done by selecting Help | Send files to tech support from the main menu. When reporting an issue it is helpful to include: 1) A summary of the problem 2) Steps needed to recreate the problem 3) Sending the asset file being used (i.e. RUT.INX, CL.CDY etc.) 4) The account files that contain any positions that are affected 5) If not in real time, the date(s) and time(s) in BackTrader being used (including the time zone you are in)Although I am backtesting I am not the most qualified due to my limited exposure to options as compared to everyone else on this forum. Of those others that are backtesting or have knowledge of results from backtesting what is the general consensus as it relates to the numerous problems that have been discussed on this forum? Have any of the problems been solved (other than the interface)? Any gotten worse? Anyone change their minds from negative to positive or visa versa as it relates to OV?