[seanb]

I'm not on Lion, but even on Snow Leopard, Sublime will only show a tab for a file if you double click the file in the sidebar, or edit the file (which Convert Tabs to Spaces is doing). Though there might be a Lion specific issue aside from this.

[emehrkay]

Oh that works. I do not like that, even though I understand the logic behind it. Maybe there is a way to make single click file show the tab

[ConstantineXVI]

The tab will also open if you start editing the file.

[emehrkay]

Sometimes I open files just for reference. Textmate/BBEdit: single click = new tab/new open document