Ardour Segmentation fault- won't start at all!

[Alexandros Bitoulas]

Hello to everyone!

I am using Kubuntu 11.04 (fresh install, added single audio packages needed) 
on my pc where I have been able to work perfectly with my guitar (rakarak and 
record in ardour with generic kernel) until some days ago.

However, since the last two days I cannot start Ardour! AFAIK, I haven't done 
something that could cause this problem. From the terminal I get only this 
output. 

alex at Kubuntu-pc:~$ ardour2
Ardour 2.8.11
   (built using 7387 and GCC version 4.5.1)
Copyright (C) 1999-2008 Paul Davis
Some portions Copyright (C) Steve Harris, Ari Johnson, Brett Viren, Joel Baker

Ardour comes with ABSOLUTELY NO WARRANTY
not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
This is free software, and you are welcome to redistribute it 
under certain conditions; see the source for copying conditions.
Segmentation fault
alex at Kubuntu-pc:~$ 

I searched on the internet and haven't found something about it...I don't even 
know with what it could be related with or what caused it! 

I want to note that everything else works perfectly (Jack, Rakarack).

Could somebody provide some help, guidelines or any information? Does anyone 
has/had the same proble with Natty? 

Thank you all in advance, 

Alex