Hi,
I have tested recently at home and at work and same problem was reproduced. I can't open my projects, trying to load them crashes always with same backtraces (Parser::blabla)
Updating/installing libkasten* to 4.10 in experimental, libsublime* 1.4 from ubuntu and kdevelop 4.4 from ubuntu solved the problem.
I would say this is unusable at the moment.