Guys - it's been a while since I've used Pharo, and in 3.0 its come along with leaps and bounds. But I'm struggling to know what many things mean, and what the UI is telling me? Is it written up somewhere? I also quite quickly seemed to get into troubles with the new Nautilus browser where it gives me walkbacks and won't let me select things. I've started again with a new image and am trying again to do some simple things - and see if I can come up with the use cases. As a starting point - I've just created a new class, with a new Category name and the class has a red exclamation mark next to it. What does that mean? Also what is the difference between Add Class, and Add full Class in the context menu? I ended up just typing over the definition of an existing class as there is no flyover help for either of these to know what it does? Tim -- View this message in context: http://forum.world.st/Red-Exclamation-in-Nautilus-tp4767242.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.