Karl
I couldn't start my copy at all ("...incorrectly installed") and received this from Abvent support:
"It seems that the main preferences of Artlantis has are in conflict with your Operating System.
"This issue comes only with OS 10.9.
"Our development team is trying to fix this."
They then gave me a solution to workaround the problem.
I suspect that this has to do with the combination of OS 10.9 on a new MacPro. It installed fine on an older iMac.
This may or may not be the same problem Agnieszka Pio has, but the Abvent support group was pretty helpful.
JIm
James C Lewis
AC 24 (Full)
Mac Pro (Late 2013) OS 10.13.5