Created Unassigned: It doesn't work [43570]

Installed and re-installed, it doesn't work .

I tried using both numerical and text values to link tables, but it always gives 'unknown error' while trying to load cascading items and the page crashes. As someone else has already said, it works only using ID as value, but this is not usable of course.
I also installed newer version of wsp package, that was claimed to solve ID issue, but it gives unknown error again.
These seem incredible errors for a version which is claimed to be stable.