Is this another VX problem to come??

My rain sensing wipers have now decided to pack up..No sensing activity whatsoever. You can trip the delay rocker and they will sweep, but left on their own they do nothing...This only leaves me with one speed wipers or nothing..Not impressed now the weather is bad.. .

They haven't really been the same since the screen was changed (RAC auto windscreens). Has anyone else had this fault or do you suffer from duff rain sensing wipers?

I'm looking for all the answers before I get the same treatment as 'basil'.