Virtual website not found errors

[d_mon]

I'm not sure if it is a confirmed bug/behaviour, but I receive 'Virtual website not found, bad dns name' with preview action all the time  :evil:  :evil:  :evil:

For example, I have working preview opened, then go to the sandbox, click on 'Browse website', select some content, click on edit next to it, then save; and then update browser window with preview it stops working
Moreover it looks that preview stops working even if I just do nothing but wait for some time and then press refresh in the browser.

It's a real pain for me, because my templates use <xsl:include> feature that is only available when virtualisation works.

Please help me, what can I do with this problem?

[d_mon]

Upd: it seems that the reason of such behaviour was the wsf imported demo website.. possibly something wasn't completely configured there but it caused regular exceptions in virtualisation server which finally caused the error. After removing that webproject all seems to work ok. Hope it's the real reason, I didn't have any virtual website not found errors since I deleted that web project