Script debugger stops at breakpoint, but its UI is hung

[Michael255]

I have had an issue with one particular instance for a couple of weeks where the Script Debugger has started hanging. It correctly stops at breakpoints but clicking any button in the window does nothing. Ie. not play/pause/step into/step over.

Eventually the transaction times out and the debugger turns itself off.

I am successfully using the debugger in other instances, so I don't think it is a browser issue. I have tried disabling all browser plugins with no improvement.

Is anyone aware of something that might cause this behavior, from a setting to a known issue, etc.?

[paulkvanover]

Same issue here and it is driving me nuts...   Vancouver Patch 7. I hope someone can help figure this out.

[George13 · Accepted solution]

Here is the solution that we tried and it worked:

Try setting the system property "glide.ua.gcf.sample_priority.enabled" to false and see if the problem is still reproducible.
You may not find the system property. If so, create it and set it to false. The type of the system property should be 'true | false'

Please refer to the knowledge document below

https://hi.service-now.com/kb_view.do?sysparm_article=KB1637446
This system property is used to disable the optimistic priority feature in GCF data collection. According to ServiceNow support there is no impact on the instance if you the property to a false.
The only impact is that it can have a few sample drops in GCF which might be ok since its usage data so it is safe for you to add the workaround in other instances as well.

[paulkvanover]

Absolutely solved my issue. Thank you so much for help. 🙂

[Michael255]

Thanks for finding that and sharing. I can now debug to my heart's content. Much appreciated.

[j_dahm]

Works here also. Thank you very much for the Help.