The updated (unified) GUI seems like a major improvement, but already finding some bugs. The most inconvenient so far is that objects/text/etc. duplicated in one window can't be copied to another. In the old 17.x Mac version, and according to the instructions for the Windows version, I should duplicate something in one window then bring the other window to the front and click where I want the duplicate. Nothing happens when I do that in 26.0.2. I don't see the duplicated objects when I bring the other window to the front like I did in 17.x and nothing is placed when I click in the new window. Seems like it's just not implemented.
There is also an odd bug where changing the pen width from 1 to 2 causes all the lines in my old custom symbols to disappear. I have to open the old symbols and change the line styles to solid for every line. They seem to be set to nothing. Maybe an import/translation issue where the old version didn't save a style and the default is none?