Undo and save broken by setting fill opacity
After long search and on call with Adobe Support we manage to pinpoint an issue where setting a fill opacity breaks XD in a way that you can no longer undo any changes, nor is this file auto-saved / saved anymore.
As far as I know you can set object Fill Alpha / Opacity in 3 ways:
1. Open the fill palette, type a new alpha value into the alpha field (which begins at 100%)
2. Open the fill palette, drag up / down on the vertical opacity slider on the right of the palette (next to hue selector)
3. Open the fill palette and drag up / down on the alpha value to change it (the one that starts at 100%)
The 3rd way breaks XD so you can no longer undo any changes or save.
So reproduction steps are:
1. open new file
2. create rectangle
3. set a fill color
4. set fill opacity by dragging the 100% alpha value down
5. try to undo this change
expected: fill opacity is back at 100%
actual: nothing happens
Thanks for your feedback. I’ve been able to reproduce this and have reported this to the team. In the future, please file bugs here: https://community.adobe.com/t5/adobe-xd/bd-p/xd?page=1&sort=latest_replies&filter=all
Thanks for your report @mpe-svk We'll have someone look into this issue.