What build are you running? DId you happen to install anything that would modify Sense without first disabling Sense? Like a new clock or the Max Manila Mod? Failure to disable Sense when you install cabs like that can lead to the problem you're describing where Sense will loop on and off. You may need/want to reflash.

If you're replying to a threaded conversation, I think the text input box isn't accessible if you slide the keyboard out [this is due to the lack of landscape support in the port of the 2.1 Manila Text App]. ...is that what you mean? Or are the actual buttons not functioning properly? In the latter case, try installing another onscreen keyboard - there are versions of EZInput attached to this threads links.

I noticed my "Home" button wasn't working properly with Sense enabled - I installed another version of EZInput to fix it. <---in case anyone else runs into this.