why would an indicator stop working ?

[tradr]

I'm using NinjaTrader 7.0.1000.8 with the 'Scalper' indicator
Scalper is included in a template and I've used it for . . . ages, but for some reason
today, no 'trigger' - a small vertical bar on the price bar - is appearing and the 'Highlight current trigger' which places an arrow next to the trigger is also not appearing

just as I've written this an arrow/highlight's appeared - how weird's that !
but I'm going to post this anyway, indicator's attached

while there's one arrow on the charts there should be dozens of triggers displayed
and they're missing, so summats up !

[NinjaTrader_PatrickH]

Hello tradr,

Thank you for your post.

I recommend upgrading NinjaTrader to our latest release, this is an over the top installation and there is no need to uninstall your current version of NinjaTrader.

You will need your license key at the following link, you can find your license key by going to Help > License Key.

Download NinjaTrader: http://www.ninjatrader.com/download-registration.php

If you are still seeing items with the Scalper indicator please contact the developer of the indicator for further assistance.

Please let me know if you have any questions.