There was an attempt to perform an action at point ..

What is "AppType"?

When you wait for the button to be visible, you address it using a full Alias reference.

But when you click it, the first part is assigned to "AppType". I assume this an object assigned further up the script? Is there any possibility this object is now "stale" if you haven't refreshed it since assigning it before waiting for the button?

If you put a sys.refresh between those two lines, does it then work? If so, it was due to a stale object ref.

Also ...

" There was an attempt to perform an action at point ..."

What is the full message? Did it fail due to visibility (assume so as that's the property you're waiting on) but it could also not yet be enabled. It may be made visible and THEN enabled in which case you may be trying to click it too quickly. But without the full error message, that's impossible to say.

If neither of the above .... I have no idea. Not sure if there is anything odd about handling dialog alerts in IE11 as use Chrome almost exclusively.