fuzzywolf

@Padishar This has been a difficult problem to isolate and reproduce. It seems to happen some times, not other. Most often with KSPI installed, occasionally with just IFS installed, never with neither installed. I spent a couple of hours running through various configurations tonight. By the way, the craft and log I posted previously were stock + MJ parts. After playing around for a little bit, I got the dv problem to manifest with a 2 stage rocket with boosters. All stock parts + MJ Here's a pic: http://images.akamai.steamusercontent.com/ugc/263835074962529594/8F97DA6A7BD9B781E56B803A27866873971CA600/ Here's the craft: https://drive.google.com/open?id=0B4Jfg2DEyipCS0JFVk1KZnM0TW8 Here's the log: https://drive.google.com/open?id=0B4Jfg2DEyipCNE82WWM1Z1ZUcnM However, upon quitting, re opening and reloading the craft -- no problem. I managed to get the problem to manifest with a 4 part rocket. Mk1 command pod -> LF 800 x2 -> LV 45. Put a decoupler between the fuel tanks and you have a problem. Pics: http://images.akamai.steamusercontent.com/ugc/263835074962539549/1CC835ED57A6345CB8A49468F7BE7BD2B7293292/ http://images.akamai.steamusercontent.com/ugc/263835074962539883/78314768C2CF87D69E135E85D77F7E5C7B26DBAF/ Log: https://drive.google.com/open?id=0B4Jfg2DEyipCdWp6ZzhDRUFFSXc I don't even know what's going on any more. I played around with different configurations for two hours and got the bug to pop up twice, but I *swear* that previously I was seeing it on every ship. Also, in two hours I was unable to get the bug to surface with IFS but without KSPI, but I know I definitely saw it there before. If I see it happenning again, I'll upload a log and craft, I guess?

There is rapid switching in values, at first. The number for the total dv remains the same (wrong) number, but it can't decide how many stages that dv should be divided amongst. After about a minute, it settled on what is in the screenshot. Upon reloading, I also noticed that enabling the verbose log caused it to settle down immediately.

@Padishar I put the output_log.txt, the .craft file and my ckan list on my drive for you to take a look at. Log: https://drive.google.com/open?id=0B4Jfg2DEyipCd2paQnpoWkhsMUU Modlist: https://drive.google.com/open?id=0B4Jfg2DEyipCbXN0TjVBRG1LdVk Craft: https://drive.google.com/open?id=0B4Jfg2DEyipCQTA1X2ZzWGlnelE Screenshot: http://steamcommunity.com/sharedfiles/filedetails/?id=672889706 The new screenshot is because I made some changes to the rocket and didn't have an exact save of the one I posted last night. I did some testing, removing mods one at a time. I think the problem might be an interaction with interstellar fuel switch, as when I took out KSPI the problem persisted, but when I took out the fuel switch mods, there was no problem. In all cases, mechjeb gave the correct answer, though. Sorry for adding to your headaches!

I'm having the same problem as fatherdoctor. KER gets the delta v wrong with KSPI installed BUT mechjeb gets the calculation right. Not sure if this thread is the right place to post, but I have a screenshot for illustration. Note that even though I have KSPI installed, the craft is using all stock parts. http://steamcommunity.com/sharedfiles/filedetails/?id=672679086