Weird MechJeb issue.

[Kerbals_of_Steel]

Current version of KSP 1.10, current version of MechJeb through CKAN, it's been working flawlessly for the couple months or so I've had it installed. Overnight, however, the menu vanished from the build screens in the SPH and VAB. Neither the dropdown on the top tool bar, or the little "MJ" icon on the bottom tool bar (where the messages ,KISpedia, ect are). The parts are still there in the build screens, and the menus and functionality are still fine in the flight screen, but nothing in the build screens, which is where I use the Delta-V helper a LOT.I manually rolled MJ back to the 2.10 version (from 2.11), same problem. Double checked my virus protection exemptions, then disabled them entirely, still has that weird partial functionality. The only thing I've changed recently was a config for KAS, but the game loaded up a couple times after that without issue. Other mods are USI-LS, KIS/KAS, Universal Storage and Easy Vessel Switch. Before I start a bug report, ect, is there some hotkey or simple PEBKAC thing that might be causing this???

Thanks in advance.

[Vanamonde]

I can't help you with that, but I can move your question to the sub where someone else might. Good luck. 

[HansAcker]

One simple thing I can imagine: Your craft doesn't include a MechJeb-enabled command pod or probe core. In that case, the MJ menu and button don't show in the editor (or flight scene for that matter).
MJ also has settings to hide the icon and menu but that probably would affect all scenes. Deleting/Moving the config in GameData/MechJeb2/Plugins/PluginData/MechJeb2/*.cfg should fix that in any case.

If that doesn't work, please upload a log file somewhere (e.g. Dropbox) and link it here.

[Kerbals_of_Steel]

17 minutes ago, HansAcker said:

One simple thing I can imagine: Your craft doesn't include a MechJeb-enabled command pod or probe core. In that case, the MJ menu and button don't show in the editor (or flight scene for that matter).
MJ also has settings to hide the icon and menu but that probably would affect all scenes. Deleting/Moving the config in GameData/MechJeb2/Plugins/PluginData/MechJeb2/*.cfg should fix that in any case.

If that doesn't work, please upload a log file somewhere (e.g. Dropbox) and link it here.

Yeah, I figured it out. Thank, Hans. A combination of not enough coffee and building some specialized components in each scene. PEBKAC, as I suspected.