When selecting a path or more paths with the Selection Tool or *Direct Selection Tool, I do not see the blue guide lines anymore. So I cannot know what is selected as well as how many anchor points are in a path. However when I put the mouse over a path, I can still see them.
How can I bring this blue lines (guide lines) back?
In addition to John's post, it could be...
View > Show Edges
And the short cut is Command/Ctrl + h
Or....
View > Smart Guides
And the short cut is Command/Ctrl + u
Sounds like you may have accidentally turned them off. To turn them back on:
View → Guides → Show Guides
You may have made them invisible accidentally by hitting the hotkey, which is Ctrl | Cmd + ;
I find myself referring to this thread pretty often, so I'll also throw in that sometimes I need to change the GPU Preview setting to get the blue lines to show up:
View > GPU Preview (Cmd+E) --> uncheck
In my CS6 x64, when using the pen tool for adding points, the smart guides don't show. However, if you add a point, then use the direct selection arrow tool to move the point, THEN you get the smart guides.
However, in CS6 x32, the add-point pen does display the smart guides on my Windows 7.
Of course, you have to have Smart Guides turned on, AND Snap-to-Pixel turned off in your View menu. I think there is a bug involved, though.
Another trick could be to use the direct-selection tool, select the shape first, then select the points to move them, and maybe then the guides will show.
This answers a very similar question, but search engines will probably lead here and I'd like to add my answer for those it helps.
I was having a problem where the path outline would not show up when hovering over other shapes. The solution is to disable View → Snap to Grid.
