Hi there, we are having this problem in all our Storyline files as well.
When we open our files, the paragraph spacing on the Master Slides has been changed, but any spacing that was manually set on the slides has remained the same (e.g., spacing between list items was set to 12pt, so spaces between list items is still 12pt), but anywhere that there was regular spacing between paragraphs, where the spacing was not manually set and relied on the spacing set in the slide master, the spacing was changed.
Original paragraph space: 18pt
Paragraph space after updating to current Storyline version: 13.5pt
The Storyline version we are using is: 3.84.31647.0
I'm attaching a test file with one slide that has both regular paragraphs and a bulleted list if you want to see the difference. Please try opening it in version 3.83.31444.0 first, then check the paragraph spacing of the regular paragraph, between the bullets, and check the paragraph spacing on the master slide, then do the same in the current version, you should be able to replicate the issue as I have.
I will say that updating the paragraph spacing on the master slide seems to have fixed it. We have not fully tested this fix, but after changing the paragraph spacing on the master, and closing and reopening the file, the change seems to have stuck.
This bug is heavily impacting our work, as we do alot of development in Storyline. Hopefully there's a fix for this soon.
While I have your attention, it would be really nice if the paragraph spacing options window could either be left open (as the accessibility and size/position window currently can be), or the paragraph spacing could be included in the Paragraph area of the Home ribbon so that you don't have to open the window every time you want to change or check something. It really slows things down.
Look forward to hearing from you soon.