Hi Dave,
The Web Testing feature works absolutely similarly in the Demo and Enterprise editions of the tool. If the behavior has changed, most probably, this is caused by a change in the tested application. Other possible causes are a slower Internet connection or faster computer.
As a workaround, you can increase the value of the 'Auto-wait timeout' option in your project. The default value is 10000 ms, and you can increase it, for example, to 30000 ms. This option is located in the Playback option group of the project properties editor. To open the editor, double-click the project node in the 'Project Explorer' panel and switch to the Properties page.
Can you provide us with access to the tested application so we can reproduce this behavior and find the best way to wait until pages in it are completely loaded?