I'm a copy and paster not a scripter but I've had problems getting some things working using mootools too (specifically with IE7), so what he says in the last couple of paragraphs strikes a chord with me.
I've just hit a problem with jQuery which seems to stop my new plugin working correctly (a scrolling version of the lastentries plugin). My workaround was to add the link to v1.4.4 into the jQuery plugin but that stops the widget panel from working - I'm currently manually editing the jQuery plugin file if I want to use the widget panel.
Curious thing was that everything worked perfectly on my wamp setup using the standard FP jQuery plugin, but the scroller stopped on the 2nd item when I tried it on my host's server.
It's quite like saying: "Flatpress had an authentication bug for two years, so I won't use it." ;-)
so I ported the widget script to jQuery: it was easier, they didin't change important APIs with upgrades and the community was bigger.
It looks like you're new here. If you want to get involved, click one of these buttons!