Recently I stumbled above a little incompatibility concerning Gnome and LXDE: when wanting to change the template in Gnome, it couln't be applied completely and some features remained unchanged. This HowTo covers an easy work around how to fix this.
While playing around with a vncserver and looking for a minimal yet eye pleasing desktop I found LXDE. I like it pretty far for the stuff you have to do via vnc, also it would take a much bigger efford if I'd like to use it as my main desktop environment, since you start missing some of gnome's comfort. As always with linux/ubuntu, and I suppose that's what I and all the fans love about it, everything you miss would be possible to configure, it would just take a major investment of time.
Back to one of the rather annoying issues that started after installing LXDE. After using gnome again on the same machine, and wanting to change the template/theme I noticed the following confusing addition to the System/Preferences menu:
At first it didn't bother me and I just had to memorize which one is for gnome and which for lxde. But then I noticed a strange thing happening, when wanting to change the gnome desktop / metacity from a light to a dark theme: the pulldown menus and the bar with the menu entries stayed light, not a thing you can do.
After some checking I had the idea that lxde might use something from metacity, since the menus look pretty much like gnome in simple. So I thought maybe I just delete the config files from lxde. Nothing changed. To make sure I didn't forget anything I just deleted the whole .config folder (this is not really clever, when you have configured a lot, in this case it was on a test account so it didn't really matter). Still no change.
Then just by accident I found a workaround to apply the new template in gnome:
1. In Gnome via System/Preference/Appearance (from gnome) choose the template you want and remember the name.
2. Choose the other Appearance entry (from lxde) and choose again the same template you just did and click apply again here.
3. Done, you should instantly see the complete changed theme in gnome.
All this happened on a machine with Ubuntu 10.04.