USING parameters truncated: I'm passing a very long URL to an InputScipt as USING parameter. This doesn't work, since the URL is truncated when I use it in the InputScript. Is there a length limitation, and how can I overcome it?
Yes, 255 characters is the maximum length of the content of USING parameters; the rest is truncated (GuiXT version 2015 Q1 3 and below). We will soon increase this limit.

Workaround:

Either use more than one USING parameter to pass the URL in several parts, or pass the variable parts of the URL only.