Display issue 1
Random lines appeared on my screen. Baseline grid and guides were hidden as I was in Preview Mode, no explanation for these lines.

Display issue 2
Text doesn’t display correctly when I apply a different Paragraph Style Sheet. (It displays the text in both the original Paragraph Style and new paragraph style on top of one another, even though the new Paragraph Style is selected). I needed to deselect and reselect another paragraph of text to rectify the issue.

Dialogue box issues
Both videos show how I’m unable to select from the drop down menu in InDesign. In the first video I want to select the ‘Photoshop Path’ from the Clipping Path dialogue box, but am unable to do so.
The second video show how I want to create a PDF (via File/Export) but I cannot change the PDF settings from the drop down menu.
Needed to quit the program and restart to rectify the problem.