I think this changed some time ago, but I didn't reported it.
When I'm in sldb and press "v" on one of the stack frames, slime brings up the source file quite nicely in another window. Previously (with xemacs), the offending form would be highlighted, with the cursor in the sldb buffer.
Now, what happens is that the offending form is very momentarily highlighted (in blue). Is my memory wrong, or has this changed?
In any case, it's certainly much nicer if the form were highlighted, even if the cursor is in the sldb window.
Ray