Signals Notebook: Text Elements fails to load or export

Text elements in Signals Notebook may occasionally fail to load in the application interface or cannot be exported to PDF. This typically manifests as a perpetual loading screen when attempting to view the element, or errors when trying to export experiments containing these elements.

Cause: These issues typically occur due to the content of the text element causing rendering or conversion problems, particularly with complex HTML structures or very large content blocks.

Solution:
1. Export the experiment in parts:
    a. Export all content except the problematic text element:
        - Click Actions > Print to PDF
        - Uncheck 'Print Entire Experiment'
        - From the Content list, select all elements except the problematic text
        - Click 'Print to PDF'
    b. Export only the problematic text element:
        - Click Actions > Print to PDF
        - Uncheck 'Print Entire Experiment'
        - From the Content list, select only the text element
        - Click 'Print to PDF'

2. Use the API to export the text element as HTML:
    a. Obtain the entity ID (eid) of the text element
    b. Use the GET/entities/{eid}/export API endpoint
    c. This will return an HTML file instead of a PDF, bypassing conversion issues

3. If the text element contains complex HTML, large tables, or special characters:
    a. Consider simplifying the content
    b. Break large text elements into smaller, more manageable sections
    c. Check for and remove any problematic HTML tags or formatting