I have a very similar problem.
while performing the following code
Element findEle = manager.ActiveBrowser.Find.ByContent("text");
I get message:
- FindParam used: [Find logic: Use 'Content' where content is 'text' of type 'TextContent' and (none) ]
- Start Element: [Element: '#comment#:-1']
ActiveBrowser was changed and set to LastOrDefault. Current active was either invisible or disconnected
How select a button?