Hi Duncan,
We are sorry but the issue is not reproducible at our end. We have created a demo sample, which can be tracked through link.
Please try the above sample and if you still face any difficulties, please share following details.
1. Essential studio version details.
2. Are you obtaining the error during initial rendering or while performing any operations in grid?
3. Screenshot of the script error along with stack trace.
4. If possible, please reproduce the issue in the above provided sample and share.
Regards,
Ragavee U S.