I believe this to be a bug with Avogadro
Avogadro version: 1.97.0 shader build
Operating system and version: macOS 12.5.1
I want to change the C-C single bond (upper right) to a double bond. I try to do it two ways:
Click on a bond:
And clicking on one atom drag to another:
That said, if I click on a bond and then clicking one and dragging to another, I do get the right thing:
Actually, there’s another thing – I can’t optimize this structure:
For reference, the force field is set to “forcefields”. But this could be part of the update to force fields that you’ve mentioned elsewhere.
I don’t know which build you’re using - I’m pretty sure the hydrogen bug was fixed recently. I’d suggest a nightly build:
No, that looks like there was a problem building Open Babel with that version.
I used this one from ~6 days ago
Right. I just don’t know if that has all the other fixes in it. The hydrogen bug was annoying - took ages to track down.