The following issues have been seen when using the "Collate all" option in the Design Summary:
1) Unable to expand + to view all messages
2) Unable to navigate up and down the list using the cursor keys
3) Focus in the window (the dashed outline around a message) can only be moved by dragging existing focus, not by clicking
Example:
Under "Error and Warnings" choose Synthesis Messages
In the Design Summary window, try to expand "+" next to any of the warnings
Highlight one of the warnings (so it is blue) and, using the cursor keys, try to navigate up or down.
Click into another warning message, the dashed outline around the previous message will still be in place
Solution
The workaround for accessing all messages is to use the "Flat" option rather than "Collate Consecutive" or "Collate All" (under the "Organize Messages" option in the lower left pane of the Design Summary).