Text not appearing correctly

Update: I received an email from Articulate support last night. The engineer said "it appears that the issue might be related to the Slide master layout applied to the Slides."  He was able to replicate the issue. 

Well, that explains when the issue occurs. But it doesn't solve the issue. 

Here's what I see in my own additional testing: 

• I add 12 points of line spacing to the text box in the Master layout. 
• I create a slide with that layout, and add 3 lines of text (separated by returns). 
• With my cursor in just 1 line, I adjust its line spacing. But that changes the spacing for all of the lines. (That didn't happen in the past. I could adjust the spacing for any single line.)
• If I add a bullet to a line and adjust the spacing directly in the Paragraph options (i.e., without first clicking the Indent button), SL applies the adjustments to all of the lines. 
• If I add a bullet, click the Indent button, and then adjust the spacing in the Paragraph options, those adjustments will impact only that line (as expected). 
  • After I've done that, I can adjust the spacing for each line.

From my perspective, I'd say that the latest update broke how the Master layout works.

• Best guess on the cause: it's related to Text Styles. 
• Another observation: In the above testing, I couldn't replicate the issue with the line spacing appearing to change when I clicked in the text box and then reverting when I clicked out. The file where I did encounter that issue was developed before the recent update. So that aspect is likely related to how the text "upgraded" to the new version that includes the option for styles. It doesn't seem to occur with new text boxes. (But we'll see...)
• What I'm sure of: Articulate didn't do enough validation testing.