I just upgraded from Karmic Koala to Lucid Lynx (10.04). I was using "India Bengali Probhat" font from the language settings given in Karmic to create Bengali documents using Open Office. After upgrading to 10.04, however, there is a problem:

Even though individual alphabets are displayed correctly, the joint-letters (jukta-akshar) are staying disjoint. Documents that were created while I had Karmic have also changed to this comical behavior. Interesting point to note:
when I go to Systems -> Preferences -> Keyboard Preferences, and select "India Bengali Probhat", the box that says "type to test settings" displays joint-letters correctly. But everywhere outside this box (gedit, vim, Open Office, etc.) the joint-letters stay disjoint.

I have close to a hundred hand-typed documents that have all become useless because of this.

I haven't seen this particular problem in any thread or in any other forum. Any help will be very much appreciated.