Well, someone has actually the exact same issue on developerworks!
Oh wait... that would be you ;)
May be RSA is preventing the Java initialization job to even start, which would be a problem as commented in bug 192112.
If not, a new bug on bugs.eclipse.org would be in order.
Actually, as the OP Yonatan Maman mentions in the comments the actual source of the problem: bug 240033.
After upgrading from 3.3 to 3.4, both the Open Type and Open Type Hierarchy
dialogs no long work.
So latest Ubuntu fails, but RHEL 5 is ok.
Linked to a GNOME gail issue (bug 575873) affecting only on new version of GTK+GAIL, as in Fedora 9 and 10, Ubuntu 8.04 and 8.10, etc.
Fixed in eclipse3.5: the final fix mentions:
/*
* Bug in GTK. With GTK 2.12, when assistive technologies is on, the time
* it takes to add or remove several rows to the model is very long. This
* happens because the accessible object asks each row for its data, including
* the rows that are not visible. The the fix is to block the accessible object
* from receiving row_added and row_removed signals and, at the end, send only
* a notify signal with the "model" detail.
*/
