Hi!
I have a similar problem! Overlay icons does not appear. I use Windows XP, SharpDevelop 3 (3105) and TortoisSVN 1.5.0 (13285)
I tried downgrading Tortois SVN with no positive results. _svn hack is disabled. In explorer I can see the overlay icons. This problem arised after intensive upgrading and developing. I cannot tell you why this happened. Do you have any idea where should I continue searching?
Thank You!
Vitya