I've recently done several compilations using github.com/JerryBlack/buildKstarsNightlyFromGit for several computers. I found that Kstars 3.6.2 works well with INDI 2.0.0, and toupcam basically has no problems.

But once Kstars3.6.3 is compiled, EKOS keeps reporting shooting failures. I believe the problem Jasem encountered most likely happened with 3.6.3, and I recorded the logs.

Also EKOS 3.6.3 has a very serious bug, Cature&Solve for Slew to Target will only parse once and then it won't work or try to rotate to fix the error. This caused me to return to 3.6.2