When I try and use the tag cloud widget, the widget below it in the sidebar gets messed up. If you look at my site now, you can see the recent posts widget is only 5 px wide. Without the tag widget, it takes up the full sidebar width, as it should.
I’m sorry but that’s not helpful, alchymyth. I’m asking about a specific problem here. Almost all websites have errors and warnings. Heck, wordpress.org has got 11 errors and 2 warnings. QuickSprout has got 48 errors and 18 warnings, TechRadar has got 126 errors and 8 warnings (worse than mine).