Then start your miner and flip to the new tab to see the issues.
So which pool are you mining with? I was making an assumption but realized you didn't say.
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
GUIminer has problems for me on btcguild, gives me an error message when connected to their pools in the US.
Just tested it a few minutes ago and I don't know why that is.
I use cgminer with the same pool and don't have any issues.
Not that I'm telling you to change miners, I just find it odd that the gui has problems whereas the command line does not.