Multiplying Lanes Bug in 5.5

Anyone else getting this bug?

I group edit in Lanes. I close the project when done. When I re-open the project later, the number of lanes would multiply - with previously split sections occupying new lanes. A 6 lane track could grow to over 20 lanes.

This bug was described in the Cubase forum here -

https://www.steinberg.net/forum/viewtopic.php?f=19&t=7352&hilit=LANES+BUG+MULTIPLYING+LANES

Can anyone help? Has the bug been identified and solved?

I am on Nuendo 5.5 / Mac Pro / Leopard