Ok here is a temporary fix.
On your main "Container" out of the DataAssist code (assuming you got a main div outside)
in its class use "overflow:auto;"
This will fix it up. If you see scrollbars then it means sth is overlaping. I had to change my content div (the outer of dataassist code) with specific WIDTH so this works. With no width or percentage i had scroll bars.
Browsers seem to think that some layers overlaping somehow.
I believe WebAssist should investigate it further to adust their code.