Hello there, glennuk.

QuickBooks uses Internet Explorer (IE) to download updates, as well as to display many of the windows in the program. Thus, you'll need to have IE as the default browser and updated to the latest version (Internet Explorer 11).

I've checked our investigation lists, and I found out that this is an on-going issue in QuickBooks. Our engineers are currently investigating and working on an immediate fix. 

In the meantime, I recommend performing the steps provided by my colleague to get rid of the script error. Before that, please start with setting up your default browser. 

Here's how: 

1. Open Internet Explorer.
2. Click the Gear icon in the upper right corner (or click Tools).
3. Click Internet Options.
4. Click the Programs tab.
5. Under Default Web Browser click the Make Default button.
6. Click OK.

Additionally, you can turn off the notification in your browser to resolve this unexpected behavior. 

Here's how: 

1. In the Internet Explorer browser, select the Tools menu.
2. Click Internet Options or press the Alt key.
3. Click the Advanced tab.
4. Uncheck the Display a notification about every script error box.
5. Then click OK.

Also, to receive resolution updates, please contact our phone support to add you to the list of affected users.

I appreciate your patience as we work through this. Fill me in if you have additional questions. I'd be around to help you out. Have a good day.