Does any of your information (username, password or domain) contain a space? If so, that would be the culprit. For a temporary fix, just put quotes around the item that has a space. Ex: if my username was True Journals, I would put "True Journals" for the username. I'll include a true fix in the next version...

On another note, I'm just about to test a fix for the taskbar bug... Hopefully a new version of rdesktop-cli will be in extras soon...

rdesktop-cli version 1.6.2-maemo1 is currently in extras! All users are STRONGLY recomended to upgrade! This version finally fixes taskbar issues!