my apologies for the delay.
i'm confused by the build log, because it seems that the C# project actually fails to compile there.
FALHA da compilaÁ„o.
"C:\Users\alex_\Documents\Visual Studio 2017\Projects\FormsClassLibrary\FormsClassLibrary.sln" (go destino) (1) ->
"C:\Users\alex_\Documents\Visual Studio 2017\Projects\FormsClassLibrary\FormsClassLibrary\FormsClassLibrary.csproj" (go destino) (2) ->
C:\Users\alex_\Documents\Visual Studio 2017\Projects\FormsClassLibrary\FormsClassLibrary\FormsClassLibrary.csproj : error MSB4057: O destino "go" n„o existe no projeto.
but in your description, it builds, but fails at runtime? Maybe the problem why you are still seeing the crash and the mentioning of the old dll version in the crash message is because the actual main executable never actually rebuilt?
i gather from the message that the identifier "go" can't be found — but i can't really comment more, sine the projects tie did send and that i did test with last week did compile here...
Also, i don't see the Elements project being built, in that log? did you build that separately, or as part of the same solution? That is the part of the log i needed to see . Maybe it would make sense to have your developer post here himself, rather than proxying, if you're it familiar with .NET and the tool chain, yourself?