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I've uninstalled KSP and then reinstalled it and that appears to have solved the issue. Thanks for everyone's help.

Thanks, I'll give that a shot.

Sorry for the confusion. I'm already using 1.6.1. I haven't checked all the parts yet but the issue is with the following: FL-T200 fuel tank FL-T400 fuel tank Rockomax Brand Adapter 02 These parts do NOT have the issue: Mk2 Lander Can Aerodynamic Nose Cone The issue is with all of the newest variants. Thanks for the current help!

I recently got version 1.6 and I'm experiencing 2 glitches (updated from 1.4). 1. The new part variants are not working. I select a desired variant but once I launch the vessel, it is reversed to the original 1.4 variant. This also occurs if I save the vessel and then reopen it. The issue is only with variants added in the two newest updates. 2. The deltaV is not accurately displaying. I have certain stages that have more than 0 deltaV but the readout still tells me that the burn time and deltaV is 0. Some stages (which include engines and should have deltaV) do not even have a deltaV amount displaying (i.e. they appear the same as in version 1.4) Once I stage the rocket to the stages that show no deltaV or 0, the deltaV pops up showing the correct value. Any help is appreciated. Tell me if I should clarify anything.