Default TF700 dock issues (freeze, not recognised)

My old TF700 dock stopped working a while ago. I ordered on eBay manufacturer refurbished dock. Problem is - it's not working as it should.

I tried different ROMs:
On Cromi-X 4.7.0 docking tablet causes it to freeze. Screen and hard buttons are not reacting (unless you do hard reboot). When I remove tab from dock it unfreezes and performs actions which were issued when in dock.
On Cromi-X 5 (latest version) it's not working at all, it is not recognised. It charges pas but there is nothing in notification area and keys are not working. Tablet uses screen keyboard.
Same goes for Crombi.

Anybody have idea what can be wrong?