SDK 6.2.0

That looks like a type error. I have type checking turned off since the apps pre-date types by a long time. Maybe something changed related to types? You could turn off type checking to test/as a workaround.

It's not clear to me if you are saying 6.2.1 specifically did this, or if you'd see the same thing with 6.2.0 too? Cannot see anything in the 6.2.1 changes which would account of this kind of issue being introduced there if it did not exist in 6.2.0. That would suggest a mistake if it is the case.

I didn't try 6.2.0, but it's probably a type thing. I added some lines of code to declare a variable using getApp() and I'm using that instead of the class path and the compiler likes that better. I suppose this falls into the category of things that we used to be able to do because the compiler was supposed to catch it but didn't but now it is?

Sounds to me like something typechecking is flagging something that isn't really a problem in the code  You may want to look at what you added for type checking

It was this prior to 6.2:

			try {
				tryProp = AppBase.getProperty(propName);
			} catch (err instanceof Lang.Exception) {
				getPropErr = err.getErrorMessage();
			}

Now it's this:

			var app = Application.getApp();
			try {
				tryProp = app.getProperty(propName);
			} catch (err instanceof Lang.Exception) {
				getPropErr = err.getErrorMessage();
			}

The compiler was complaining about a symbol, not type, but it seems like it can resolve symbols better when they are part of a object variable vs. a class reference? Maybe it's an obscure enforcement kind of thing?