Have you ever checked your blog in other browsers? For example if you use Internet Explorer have you ever seen your blog on Firefox, chrome or Opera?
I use a couple different browsers when I review blogs. Generally it's IE9, Firefox or Safari. Those are just my 3 (from my PC & iPad). It's pretty interesting to see bugs and changes across browsers being a web designer but there are some really big problems that can happen as just an average blogger. Like for example:
- your background not showing up and your white text completely hidden against a white background
- one of your sidebars knocking your main content totally off the screen
- a widget glitch stopping your page from loading entirely
I always feel funny emailing people that I can't see their site or content but they are generally grateful and unknowing of the issue because they are using a different browser. And I am equally grateful when someone lets me know they had site issues as well.
Or another trick to try that doesn't require any downloads (although the popular browsers are free) is to check your blog out on other peoples computers. Different monitors and settings may change the appearance of your blog. Not usually enough to cause major issues... but it's always good to see what others are seeing.