Hi there,
That's a strange bug, i haven't seen that before. Does it let you type a value in (ctrl+click the slider)?
What does the "soft fall" value in your config.xml say?
When I hold [control] to click the slider, I can input a value, but any number I put under 1.00 just defaults to 1.00. However, I can input any amount above 1.00 and it submits that amount just fine.
In the .xml, it says (softFall="1.0000038") when it gets stuck on 1.00. However, when I input in, say, "2.52", the line then reads (softFall="-34.24704").