I added the following incomplete linear-gradient rule,
.appBackground {
-fx-background-color: linear-gradient(from 0% 0% to 0% 100%, );
}
The App enters an infinite loop at load time displaying the following warning.

This makes the VT to be unusable as soon as such rule is typed by the user.


WARNING: com.sun.javafx.css.parser.CSSParser term Unexpected token 'EOF' at file:/C:/Users/jfdenise/client.next/fresh-authoring/authoring/authoringtool/samples/IssueTracking/build/classes/issuetracking/sample.css[-1,-1]
WARNING: com.sun.javafx.css.parser.CSSParser term Unexpected token 'EOF' at file:/C:/Users/jfdenise/client.next/fresh-authoring/authoring/authoringtool/samples/IssueTracking/build/classes/issuetracking/sample.css[-1,-1]
WARNING: com.sun.javafx.css.parser.CSSParser term Unexpected token 'EOF' at file:/C:/Users/jfdenise/client.next/fresh-authoring/authoring/authoringtool/samples/IssueTracking/build/classes/issuetracking/sample.css[-1,-1]
WARNING: com.sun.javafx.css.parser.CSSParser term Unexpected token 'EOF' at file:/C:/Users/jfdenise/client.next/fresh-authoring/authoring/authoringtool/samples/IssueTracking/build/classes/issuetracking/sample.css[-1,-1]
WARNING: com.sun.javafx.css.parser.CSSParser term Unexpected token 'EOF' at file:/C:/Users/jfdenise/client.next/fresh-authoring/authoring/authoringtool/samples/IssueTracking/build/classes/issuetracking/sample.css[-1,-1]
WARNING: com.sun.javafx.css.parser.CSSParser term Unexpected token 'EOF' at file:/C:/Users/jfdenise/client.next/fresh-authoring/authoring/authoringtool/samples/IssueTracking/build/classes/issuetracking/sample.css[-1,-1]
WARNING: com.sun.javafx.css.parser.CSSParser term Unexpected token 'EOF' at file:/C:/Users/jfdenise/client.next/fresh-authoring/authoring/authoringtool/samples/IssueTracking/build/classes/issuetracking/sample.css[-1,-1]
WARNING: com.sun.javafx.css.parser.CSSParser term Unexpected token 'EOF' at file:/C:/Users/jfdenise/client.next/fresh-authoring/authoring/authoringtool/samples/IssueTracking/build/classes/issuetracking/sample.css[-1,-1]
WARNING: com.sun.javafx.css.parser.CSSParser term Unexpected token 'EOF' at file:/C:/Users/jfdenise/client.next/fresh-authoring/authoring/authoringtool/samples/IssueTracking/build/classes/issuetracking/sample.css[-1,-1]
WARNING: com.sun.javafx.css.parser.CSSParser term Unexpected token 'EOF' at file:/C:/Users/jfdenise/client.next/fresh-authoring/authoring/authoringtool/samples/IssueTracking/build/classes/issuetracking/sample.css[-1,-1]
WARNING: com.sun.javafx.css.parser.CSSParser term Unexpected token 'EOF' at file:/C:/Users/jfdenise/client.next/fresh-authoring/authoring/authoringtool/samples/IssueTracking/build/classes/issuetracking/sample.css[-1,-1]
WARNING: com.sun.javafx.css.parser.CSSParser term Unexpected token 'EOF' at file:/C:/Users/jfdenise/client.next/fresh-authoring/authoring/authoringtool/samples/IssueTracking/build/classes/issuetracking/sample.css[-1,-1]
WARNING: com.sun.javafx.css.parser.CSSParser term Unexpected token 'EOF' at file:/C:/Users/jfdenise/client.next/fresh-authoring/authoring/authoringtool/samples/IssueTracking/build/classes/issuetracking/sample.css[-1,-1]
WARNING: com.sun.javafx.css.parser.CSSParser term Unexpected token 'EOF' at file:/C:/Users/jfdenise/client.next/fresh-authoring/authoring/authoringtool/samples/IssueTracking/build/classes/issuetracking/sample.css[-1,-1]
WARNING: com.sun.javafx.css.parser.CSSParser term Unexpected token 'EOF' at file:/C:/Users/jfdenise/client.next/fresh-authoring/authoring/authoringtool/samples/IssueTracking/build/classes/issuetracking/sample.css[-1,-1]