Apologies if this is the wrong part of the forum for this.
I've spotted a small bug in the latest version of Roundcube (0.9.0) when using IE 8. When you scroll to the bottom of the message list in IE (assuming you have more than 30 or so messages) and click on the messages near the bottom the message list jumps to the top again. This means you can't double click a message to read it.
This behaviour didn't happen in the last release and changing skins doesn't fix it either.
Fixed here https://github.com/roundcube/roundcubemail/commit/8ad2c98e9d596e44ea0a20c4412a1820a75ba1d5
Awesome, thanks!