10 Nov 2004
20 Apr 2011
Link to this post
I've noticed this issue as well. With 4.0 I only had to re-build my site if I made code changes (code behind file changes) but I could change the html mark up in user controls and see the changes immediately. After upgrading to 4.1 I have to re-build my site after even the simplest of changes to html markup, really really annoying.
I have no idea what the cause other than it worked fine in 4.0 and something with 4.1 has changed.