Recently active topics in Last.fm tagged with mixture

Hi, i just tried to post this question, but as it seems not to have worked I'll try again:

Was there a change regarding the similar-artist-radio some two or three weeks ago? I've been a regular listener to the similar-artist-radios for "Stars" and "Regina Spektor", and I've been getting their songs regularly on these stations. Mostly the stations started with the respective artist.

That has changed now. I'm still listening to these radios and if the radios had stayed the same, I guess I should get around 6 or 7 songs per week for each of the artist. But I got none. So I presume, that the main artist got excluded from the similar artist radio stream.
Is that the case?

I don't want to go back to listening to my playlist just to listen to my favorite artists. That's boring after some hours and the stream won't resonate a specific mood I'm in in that moment.

I'm using the stand-alone client in winxp (discovery mode is turned off and can't be turned on for similar-artist radios).

Please, give me a chance to listen to my favorite artists. I'm getting a little frustrated with last.fm. I've been listening to my streams for half a month now, but I didn't get the music I wanted to listen mainly.