I am experiencing very strange problems with nautilus in my Ubuntu linux. When I go to Places and click Home Folder (or any other nautilus item, a bookmark, for example), nautilus hangs at the bottom for a while and the dissapears - nothing gets opened:

However, if I type nautilus in command line, or open a folder from the Desktop, everything works fine.
I cannot recall when it has started, but it gets quite inconvinient. What could be causing this behavour? If it's hard to tell, then how can I diagnose/debug the problem?
I have used 10.10 and recently upgraded to 11.04 (it did not solve the problem)
Thank you!