Here are steps to troubleshoot your presentation problems:

1. Check the compatibility of the version of PowerPoint with the version of the operating system.
2. Ensure that the text you’re trying to insert is the right size/format and language.
3. Reboot the computer and try again.
4. Check the transparency of the background of the text.
5. Check the color of the text
6. Check for any obstructions that may be preventing the text from being seen.
7. Use font tools to fix and align text
8. Update the version of PowerPoint for more advanced features.
9. Ensure that animations are enabled and not disabled.