After having add a release to MB, let’s say I have ripped the CD to submit AcoustIDs :

2. Click Lookup CD
3. Select my edition
4. Click Add folder
5. Select my rip
5. Click Cluster
6. Double‐click the new cluster to see its content and select it at the same time
7. Click Scan
8. Drag and drop tracks
9. Click Submit

When I double‐click in upcoming version 1.4, the Info panel is showing up (it didn’t use to show up) and I have to press Escape key to go on.
I don’t know if it’s by design or a regression.
If it’s by design, I’ll have to click the small + instead of double clicking that large cluster title (more convenient).