using Dataflex Studio 18.2, Version 18.2.71, build 18.2.84.0
Windows 10 Home, build 16.299.rs3-release.170928-1534
I'm using the latest verions of McAfee Live safe. occasionaly if reports a Threat in the Train_Invent.exe I* have not been able to copy the message or find any details or where "the threat" was quarenteend
there were several, one was Real Protect-SS19EF28DDF1711 this may have been before the update to the windows 10 version mentioned above.
In the TrainSubclass entry screen, the error appears when I use the selection List.
In the trainCatalog entry screen, The error appears when I use the selection list.
BTW, I tried reindexing, deleting and recreating the index and selection list.

Gail