IE7 Freezing while opening new page while streaming

It's not yet clear to us what exactly happened but one of our customers had a freezing-IE7 problem with his application that was somehow related to Lightstreamer:

In this application a main page was used to host the master push page. A link in this page was used to open a new window showing real-time data. This second window was a frameset composed of 3 or 4 different pages (slave pushpages).

On IE7 opening the second window lead to a complete freeze of the browser. This freeze was easily reproducible on that application but we were unable to reproduce the issue with a simpler test case or to deeply analyze the application code.
Anyway we found out that part of the problem was that, while the second page was loading, a HTTP 1.1 streaming connection was open. Switching to HTTP 1.0 solved the issue!

So, in case you're experiencing something similar you may want to only use HTTP 1.0 on IE7 browsers. If that's the case, open your Lightstreamer_conf.xml configuration file, search for the <use_http1> element and replace it with the following one:
<use_http_11 value="Y"><br /> <br /> <special_case value="N"><br /> <user_agent contains="MSIE 7.0" /><br /> </special_case><br /> <br /> </use_http_11>

NOTE: Lightstreamer html client library works great on IE7; apply the above workaround only if you're actually (and regularly) experiencing the same issue.