It sounds very much like you just need to clear your cache. Browsers cache all kinds of stuff, and changing .htaccess files only complicates it.
Another user recently had exactly the same problem, and a "clean" browser was all it took for him to be "in business".
If you are using FireFox (as I am!) you may need to actually "close" your browser - I have had inconsistant result with just clearing the cache in some instances.
More on this can be found in this thread. Reading that ought to help, but if not, just post back and we will figure it out.